Backend gps jobs

I need php developer which can do phonepe integration in WordPress website using php coding in ngo website for accept donation without using wordpress extension (wordpress provide only e commerce website extension for phonepe integration) so we need php developer which can create a integration of phonepe busniess in a page using php.

I'm looking for an expert in FlutterFlow to mentor me on specific advanced topics. I need to grasp the backend functionality, Firebase rules, state management, and data handling aspects quickly. I will need 20 hours of training (5x4h or 10x2h sessions) Key areas I would like to focus on: - Implementing backend functionality: Advanced backend functionality is my primary learning goal. I need to be able to understand and implement complex backend features in my apps. - Firebase rules: A good understanding of how to set secure and efficient rules in Firebase is essential. - State management: I need to understand advanced state management techniques in FlutterFlow. - Data handling: I need to learn how to efficiently handle data within my applications and und...

..."cerebro" para conversar y tener relaciones con las sex dolls. Los modelos de personajes estarán basados en los sex doll que las marcas fabriquen: es decir, con ciertas características físicas. La personalidad, historia, contexto, skills, se las daremos nosotros a través de una "conciencia" al XX% similar en todas, variable en un porcentaje para cada caso, que se modificará a automáticamente desde un backend (por ejemplo; si es más inteligente o menos, si se dedica a humanidades o ciencias, si tiende a ser más directa o más tímida, etc.) Y con la mezcla de esos skills, y de la historia en contexto que se le de a cada personaje: serán diferentes, tanto física como a nivel intel...

... you will be responsible for creating a user-friendly interface that allows restaurant owners and managers to efficiently manage their operations. Responsibilities: - Design and develop a responsive dashboard for a restaurant management system using React. - Implement user interface components and features based on design mockups and wireframes. - Collaborate with backend developers to integrate frontend components with backend APIs. - Optimize the dashboard for performance and scalability. - Conduct thorough testing to ensure cross-browser compatibility and responsiveness. - Work closely with UI/UX designers to ensure a seamless user experience. Requirements: - Proven experience as a Frontend Developer, preferably working with React. - Strong proficiency in JavaScript, ...

...hosted on Digital Ocean. The app works well on the frontend, but experiences issues with the backend. The problem is that the backend stops working whenever the terminal shuts down. I'm not sure if I've configured my backend server on Digital Ocean to run as a service or in the background. Key points: - Need troubleshooting to determine and resolve why the backend stops working when the terminal is shut down. - Check if the backend server is set to run as a service or in the background on Digital Ocean. - Ensure the app is fully functional and accessible after deployment. Ideal Candidate: - Proficient in React and FastAPI. - Experienced with deploying applications on Digital Ocean. - Understands backend server configurations and ser...

The goal is to create a mobile application (ios, android, web) for events management. It will be necessary to develop 4 applications: • Mobile application (users) • Back-end Admin • Back-end Organizer • Ticket scanner

I want to full frontend+backend. PHP

...setting up SignalApp's source code from the designated repository. 2. **Redesign**: Customize the app's appearance, including UI elements, color schemes, and branding assets, to align with our organization's branding guidelines. 3. **Configuration**: Configure the app settings, such as server endpoints and authentication mechanisms, to seamlessly integrate with our infrastructure and the server backend. A cluster of servers for load bearing purposes have to be installed on dedicated servers. 4. **Testing**: Conduct thorough testing to ensure the functionality and performance of the redesigned app across various devices and platforms. 5. **Deployment**: Deploy the customized SignalApp on both iOS and Android platforms, following deployment guidelines and best p...

I've successfully integrated Magento 2.4...integrated Magento 2.4 and Stripe payment within my Flutter app, but encountering an issue when the app goes live. On live, the app displays error messages when processing payments, but works perfectly in the sandbox. These errors are originating from the Magento backend, indicating a possible misconfiguration or setup problem. Ideal candidate should have: - Solid experience in Flutter app development - Proven experience with Magento 2.4 backend - Deep understanding of Stripe payment integration - Ability to troubleshoot and fix backend issues I need a capable developer to identify, troubleshoot, and fix this issue promptly. The final product should ensure the app processes payments effectively on live environmen...

Need a react native app and laravel developer who can make changes in mobile application and its backend web admin panel: 1. Need each project description 1 or 2 lines at the very beginning before the containers and need an option in backend panel to enter that info 2. If we go into each interest or project we will see multiple campaigns here first of all i need all this campaigns in a line one after another or in a column and now each campaign will have its own set of pictures which user can see via slide 3. Further i want to change the look and feel of the container i have reference available 4. Secondly each user has its own donation history which you can see right here i want this particular rows showing particular transaction clickable through which user can see thei...

LINE WORKS is a popular business communication tool, mainly in Japan. You dont need to it or know Japanese to help me get an access token though. I urgently need someone who can provide me with a LINE WORKS access token for my backend. The process is cumbersome and involves several times of sending data in specific formats back and forth, but it should be easy for someone familiar with the process. I will give you the specific IDs needed before you start. The instructions on the LINEWORKS dev page are only in Japanese, so you need a translation tool. Here is the link> Key Requirements: • Expertise in Lineworks API • Proficiency in Python • Ability to deliver within a tight deadline

We are seeking a skilled and experienced full stack web developer to complete the development of our website and backend. The project is in progress with a full Vue.js template already in place and the foundation of the project built up. Your primary responsibility will be to finalize the website and backend development, ensuring that all features and functionalities are implemented accurately and efficiently. The ideal candidate should have a strong background in web development, proficiency in Vue.js, and expertise in backend development using appropriate technologies. Attention to detail, problem-solving skills, and the ability to work independently are essential. If you are a talented developer looking to contribute to an exciting project, we would love to hear fro...

I'm in need of a professional who can help me list a range of jewelry findings on Amazon. This task involves: - Listing: Editing current products, creating product listings for different types of jewelry products. - Keyword Optimization: Including relevant keywords to improve searchability and vi...improve searchability and visibility on the platform. - Categorization: Ensuring the listings are correctly categorized to reach the right target audience. - Images: Adding high-quality images of the findings to attract potential customers. The ideal candidate for this project should have experience in Amazon product listing, particularly in the jewelry category. Knowledge of SEO and Amazon's backend processes would be beneficial. A keen eye for detail and good organizational ...

I need a Full Stack Developer comfortable with React, Sass, .NetCore, and SQL Server to work on my website, web application, and mobile/desktop app. The primary goal of this project is to develop a responsive, high quality website...Server on the windows using Stored Procedure and required API is prefered where you can convert existing java based api to the .NetCore Let me know your expertise in this and same time propose me your quotation with time table to proceed. Ideal skills and experience for this project are: - Proficiency in React and Sass for frontend development - Strong experience in .NetCore for backend development - Familiarity with SQL Server, including stored procedures - Previous work developing user authentication systems - Ability to create responsive design

I am looking for a seasoned expert proficient in email marketing, particularly with using Brevo or a similar cost-effective platform. The primary goal of this project is to create a pop-up form for promoting a product or service. The successful freelancer should be familiar with: - Designing pop-up forms - Implementing Email Marketing Automation workflow - Creating catchy Design - Setting...goal of this project is to create a pop-up form for promoting a product or service. The successful freelancer should be familiar with: - Designing pop-up forms - Implementing Email Marketing Automation workflow - Creating catchy Design - Setting up automated responses and replacing them with current default templates in woo-commerce. This work has to be done professional/clear / no mess-up at ba...

I'm looking for a full stack developer who can work comfortably on both the backend (Node.js) and frontend (React.js) of a web application. Key Requirements: - You should have solid experience with Node.js and React.js - You will be responsible for building the backend and frontend of the web application - The project does not require third-party integrations or APIs. - Previous experience in building web applications is a plus If you have the necessary experience and skills, I'd love to discuss this project with you. Please bid with your relevant experience and portfolios.

Note my budget not more 20$ Requirements: Create custom chatbot web app ( including frontend backend) based on custom LLM model or open source huggingface API that can learning from people throughout chat

i will connect react js with your backend which is in flask

I'm looking forward to having a maritime-themed WordPress website developed that focuses on advertising services. Namely, it needs to: - Showcase Maritime Consultancy - Highlight Ship Brokerage Services - Promote Sea Cargo Services A key aspect of the site should be the inclusion of specific information about Tonga's maritime and GPS charts. Ideal freelancers for this project are those with WordPress proficiency and a working knowledge of the maritime industry. Previous experience in diverse service promotion is preferred, but not mandatory. Incorporate a user-friendly interface and dynamic elements for an engaging user experience. Please note, responsiveness for various devices is critical.

I'm looking to create a custom pick and mix e-commerce site on Shopify for my candy business. The website should have a similar functionality to 's pick and mix section. Key Features: - Approximately 20 different candy options available for selection. - Customers should be able to choose between half pound or one pound optio...candies in one order. Ideal Skills and Experience: - Proficient in e-commerce website development, preferably with prior experience in food or candy sectors. - Strong grasp of user experience and design principles to ensure a smooth and engaging customer journey. - Capability to implement a user-friendly and efficient candy selection process with the specified weight options. - Understanding of backend management to control the mix of candies per o...

...and customization, and our budget ranges from $500 to $ project involves customizing a quiz test app, where the mobile app design is already prepared and nearly complete. We need skilled Flutter developers who can quickly implement the design, handle user authentication, integrate APIs for quiz functionalities, and ensure smooth data flow between the frontend and backend within the given time the backend side, we require Laravel developers who can efficiently set up a robust infrastructure for managing user data, create RESTful APIs for seamless communication with the mobile app, and implement basic anti-cheating measures to prevent unauthorized access during exams. For the admin dashboard, we are considering both React and Vue.js developers. The selected developers wi...

...user-friendly interfaces? We're seeking a talented developer to bring our online marketplace to life by developing its frontend using the latest Angular version. If you're passionate about clean coding, adhering to best practices, and creating seamless user experiences, we want to hear from you! Project Overview: - Design Ready: Figma designs are prepared and ready for implementation. - Backend APIs Ready: Our backend infrastructure is set up and waiting for the frontend to complement it. - Frontend Development: Your main task will be to develop the frontend part of our online marketplace using Angular. - Responsiveness: The website must be responsive, utilizing Material UI for a consistent and amazing user experience across all devices. - Mobile Optimization:...

...the tracking Number information for each respective each parcel/AWB. Attached a sample of the Tracking number of DHL on a mobile. Our Brand and logo will be shared during the chat. ------ below 5 main forms the I think will be required. - Customer : Customer ID Full Name, Phone1, Email, creation_Date - Address : Label, (ex: USA-Warehouse Address, City, Country, GPS coordinate, QR code of the GPS coordinate. - Shipping Label: Origine Address, Destination Address, Order No (From QuickBook), Reference_PO, Weight, Dimenssions, Tracking Number, Tracking BarCode, Delivery instruction, Package No, timestamp - Tracking Tracking_Number, Carrier_Tracking_Number, Lot Number, Expected Delivery Day, Customer:FULL Name, Status message, (sug...

...exclusive for iOS platform. The desired application should include several core functionalities: • GPS Tracking: The app must include accurate GPS tracking to note the location and movements of 'family' cars. • Reservation System: Users should be able to book cars in advance, ensuring freedom and flexibility in usage. • Driver Assignment: The driver assignment mode should be manually performed, giving the flexibility of choosing preferred drivers. In addition, the application should also calculate the cost per user per month, which factors in both fuel and driver cost. The ideal candidate for this project has experience in iOS application development, specifically with features such as GPS tracking and booking systems. Familiarity with cos...

Note my budget not more 20$ Requirements: Create custom chatbot web app ( including frontend and backend) based on custom LLM model that can learning from people throughout chat

...functionalities and prepare for future mobile app development. This remote contract opportunity may lead to a full-time hire based on performance. Project Overview: College Recruit Pro is in a soft deployment phase, needing significant enhancements in backend integration and UI/UX design. We are set to integrate complex datasets involving U.S. colleges and athlete statistics through a digital interface, with the next phases focusing on mobile development and further UI/UX enhancements. Responsibilities: Finalize Backend: Solidify backend functionality using AWS, Django, and PostgreSQL to handle complex data integrations. UI/UX Enhancements: Implement a modern and visually appealing design to improve navigation, user flow, and streamline the registration process. ...

I need a developer proficient in React to help me set up a dropdown menu in the header of my website based on Figma graphics. - The dropdown needs to call functions that change the content of the workspace and also display information about different statuses on the respective page. The status has to be displayed in a circular representation and will be delivered by the backend in a next step - The menu should be automatically generated from a configuration file (e.g. Json) - The menu is supposed to drop down in a smooth animation, appearing from "behind the header" - The code has to be modular, the rest of the layout is already being coded an the dropdown has to be integrated - The menu should consist of reusable components that are created in typescript. - The graphic...

I'm seeking an expert developer to help me create a comprehensive ticket booking platfor...create a comprehensive ticket booking platform. Here's a rundown of what I'm looking for: - **Client Website**: The website should be user-friendly and responsive, accessible on both web and mobile (Android and iOS) devices. - **Payment Integration**: I want to offer various payment methods to users, including credit/debit cards, digital wallets, and net banking. - **Backend CMS for Theatres**: The system should provide a backend panel for theatres to manage showtime schedules and other related tasks. - **Admin Panel**: An admin panel is needed to monitor and manage the entire system, including the theatres. - **Mobile App**: A mobile app should be developed to allow use...

I'm looking to have a Fintech Fuel App developed, primarily for individual car owners. Key Features: - Fuel Pricing Updates: Real-time updates on fuel prices from various stations using their API. - Fuel Station Locator: GPS-based station locator with route guidance. - Payment Integration: Secure and seamless in-app payment options. - Auto Related Deals and Coupons: Exclusive offers for vehicle-related products/services. The app is to be built for both iOS and Android platforms, ensuring broad accessibility. Prior experience with fintech or fuel related apps is a plus. The ideal developer should be able to design and implement our already made sketched out design.

I am seeking to work with an experienced web application developer with expertise in using Python for backend development, JavaScript and HTML for frontend. Key Components: - Backend programming using Python - Frontend programming implemented with JavaScript and HTML Key Functionalities: - Database Integration: The software developer should be able to create a seamless link to an existing database and enable secure data exchanges. there is already excel .xlsx file in the folder - API Integration: The project includes integration of specific APIs to provide essential functionality for the Web Application. Purpose of the Project: - The main goal for this project is to develop a functional web application and host it either on a server or GitHub. The application isn’t...

...Options - Advanced search filters for easy navigation and discovery of listings - Searching inside the filtered results. - Messaging System - In-app messaging functionality for communication between sellers - Payment Gateway Integration - Secure payment processing for transactions - Notification System - Push notifications for new listings, messages, bids, etc. - Admin Panel - Backend dashboard for managing users, listings, payments, and overall platform operations. - Analytics and Reporting - Insights into user activity, popular listings, revenue generation, etc. - Rating and Review System: - Allow users to rate and review sellers based on their experiences Key Features for the Web Application: - User registration/login - Listing management - Auction m...

Im so sorry for foreigners but this project must be done by Brasilians. Required Skills and Experience: Full stack, familiar with Frontend (Ionic), Backend (Firebase) and Gatway Pagar.me. Proven experience with marketplaces. The keys os this project is to suit my marketplace under regulations os Central Bank The changes required are in the link: We already have another team working with the items 2 and 5, so we need developers to itens 1, 3 and 4.

I am seeking a professional developer who can create an effective payment gateway integration for my online health supplement store, Madecal shop. Key Tasks: - Implement Credit Card Processor system to facilitate secure transactions. Ideal Experience: - eCommerce backend development - Extensive experience with payment gateway integration, specifically credit card processors - Familiarity with the health supplement industry is a bonus yet not mandatory I anticipate an efficient and secure payment process that operates seamlessly and guards against any potential fraud or data breaches. My main goal is to provide customers with a smooth and safe purchasing experience.

We are seeking an experienced Unity developer with expertise in AR and GPS integration to simplify and enhance our existing AR mobile app for iOS and Android. The app features ten AR stations and allows users to create custom paths to navigate these stations. The app utilizes Unity for development and incorporates Niantic SDK for AR functionalities. Our goal is to improve user experience and app performance through several key updates. Key Deliverables: 1. Compatibility Check Implementation: Implement a feature to check whether the user's device supports the AR functionalities of the app. This feature should inform users immediately if their device is incompatible, ensuring a smoother user experience. 2. Map Navigation Enhancement: Revamp the map to serve as the central navi...

I'm ...the available job opportunities. - Resume Upload: Users should be able to upload and attach their resumes to their profiles. This feature is essential for job seekers to apply for the listed positions. Ideal Skills and Experience: - Proficient in web development: Experience in developing web applications, specifically job portals, is highly preferred. - Frontend and Backend Development: Strong knowledge of both frontend and backend development technologies is required to build a functional and user-friendly website. - Database Management: Ability to store and manage user data and job listings in a secure and efficient manner. - User Experience (UX) Design: A good understanding of UX principles and design is crucial to ensure the website is intuitive and easy to n...

I need a backend api (or program) that running on java or .net that can send messages via facebook messenger (do not use Facebook APIs) using Selenium or other automation frameworks you are familiar with (if you use other automation frameworks, you must notify me for confirmation). Key features: 1. Log in with the provided the user/password. 2. Send messages to specific Facebook users with provided information. 3. Send Messages from more than 2 senders to specified receiver in a short time. 4. Receive messages from Facebook users in real time (can get username information, message content). 5. Facebook will not block messages for spam reasons (the limitation is defined by you). Must-have skills: Java (familiar with Spring Boot) or C# programming skills (familiar with .Net core) Nice...

Seeking a server specialist familiar with handling tasks on a dedicated server, predominantly Linux Server The tasks include: - Expertly masking or hiding the server's backend IP from the public view. - Seamless integration of the server with Cloudflare. - Closing off all unnecessary or unused ports to enhance cybersecurity measures. For this project, you should possess a deep understanding of server administration, Linux operating systems, and Apache web server. Familiarity with Cloudflare or similar web infrastructure and website security services is a must. Speed, efficiency, and an eye for detail will be key elements for this task's successful completion.

Deliverables - Full fledged and mobile app (ios&android) with admin backend pannell. - Nearby Store locator - User can place a order with the combination of 3 (ex. Customer will chose part 1 of order from the multiple options, after selecting part 1, user will choose part 2, then part 3 from multiple available options and each item from each part will include individual cost and after choosing all 3 combinations it will be redirected to checkout page which includes all the details of selected items including cost breakdown, afterwards to payment page. - Web and app includes trending section, offers sections, trending designer collection section. - Blogs. - Gift cards. - influencer affiliate program. - Basic pages such as, contact us, about us, customer support, tracki...

I need an Android application to be developed, focused on a native share feature within a webview. share button working natively in andorid browser. but not work natively in webview app. it should be work natively in android. Key Requirements: - Platform: Android - Function: The primary goal of the share button is to enable users to easily share the URL of the website accessed through the webview. Compatibility: - The app should be compatible with all current versions of Android. The share button will be a part of a WordPress plugin, so the developer should be able to integrate this feature into the app seamlessly. The ideal candidate should have experience with: - Android development - Webview implementation - Native share functionality - Integrating WordPress plugins into Android app...

We are seeking a Laravel developer to create a ready-made solution for an API with JWT authentication and OTP verification. The project aims to provide seamless user authentication and secure communication between Android, iOS apps, and backend servers. Key Features: User Registration and Login: Users can register using their mobile numbers and receive OTP for verification; Upon successful verification, users can log in securely using their registered mobile numbers. OTP Verification and Rate Limiting: Implement OTP verification for user registration and login; Integrate rate limiting to prevent abuse and ensure security during OTP verification. JWT Authentication: Generate JWT tokens upon successful OTP verification for secure authentication between client apps and the server; I...

I need a website like Guesty has alot of features, we only need Landing page, Login system And when you sign in, you get the Admin panel, please check the below video for the Admin panel. Guesty is like a backend for displaying details of check-in, checkouts, and bookings of the hotel/property which is integrated using Airbnb and booking dot com API. We currently don't have API so we need to create this website without API as of now but having all the features in the dashboard you can see in the below video. We don't need a payment gateway. We need the panel so that the property owner can connect his Airbnb account and booking dot com account with our website and maintain his property bookings. Again telling you we don't have Api yet so the website will be with...

I'm in nee...where user can chat with my AI engine. I have my backend ready. I need frontend developer who will integrate backend APIs to develop a React website and mobile APP for both Android and IOS using React Native. Also need to give support until the APPs will be approved on APP store. I will provide FIGMA design for both APP and website. There will be approx. 8 pages for website design. Ideal Skills and Experience: - Proficient in React JS: Since the main goal is to develop both web and mobile applications, a strong understanding and experience with React JS is essential. - React Native Expertise: The mobile application should be able to support both iOS and Android, so solid experience with React Native is a must. - Freelancer can integrate my backend ...

I'm seeking a skilled UI/UX designer to assist in creating engaging and professional designs for a cybersecurity mobile application. The key responsibilities include: - Developing real-time data visualizations: Specifically, the designer is to incorporate widgets to display data fetched from an existing backend server via API. - Implementing professional and sleek design preferences: You should be capable of creating a design aesthetic that reflects a professional and sophisticated representation of data. - User authentication design: This also forms part of the project requirement. - Design a splash login screen and implement animations to enhance user experience. Initial drafted mockup is ready. Ideal skills and experience: - Proven UI/UX design experience, preferably in...

...ensuring that our platform not only meets current technological standards but also adapts to future advancements and user needs, enhancing both the scalability and functionality of our services. Responsibilities: WordPress Plugin Development - Design, develop, and maintain a WordPress plugin that integrates the WordPress frontend with the .NET-based middleware, enhancing user interactions and backend connectivity. Middleware API Development - Build and maintain a robust middleware API that acts as the central communication hub, interfacing with various system components to streamline operations and data flow. Azure Messaging Service Integration - Configure and manage Azure messaging services to handle asynchronous communications, ensuring efficient and reliable data ...

Check the attached PDF and then only bit. I need a website developed to aid in managing my company. Key elements of this project include: - Creating a website with a range of 10-20 pages - Implementing functionalities such as user registration/logi...content to match our brand and voice, making the site visually compelling. The site must be responsive and compatible across all devices. Secure and reliable architecture to facilitate user registration/login is crucial. Furthermore, the implementation of an efficient booking system for appointments is required. This feature should be easy for both the clients to use and for us to manage on the backend. Let's collaborate to boost my company's efficiency through this web solution. Please Find The Website Work Flow And Scr...

...(without the background) Backend settings: Enable engravings in the product Backend settings: two background pictures per product (2 sites / directions) Backend settings: amount of chars per line See for Example Engraving of uploaded graphics (customization) of our products, visible on the product during purchasing process possibility to Upload images for engraving, visible on the product during the purchasing process, attached to order confirmation by email check after uploading resolution of the file check amount of colors of file Export of engraving file from the shop as graphic file in bmp / jpg format Backend settings: Enable engravings

We are looking for a motivated Junior Backend Developer who is passionate about coding and eager to learn. In this role, you will have the opportunity to work on exciting projects, collaborate with a talented team of developers, and gain valuable experience in backend development. If you have a strong foundation in programming and a desire to grow your skills, we want to hear from you! Responsibilities: Collaborate with senior developers to understand project requirements and translate them into technical specifications. Develop and maintain backend systems and applications using industry-standard programming languages and frameworks (e.g., Python, Node.js, Django, Flask). Write clean, efficient, and well-documented code that adheres to coding standards and best prac...

...processes, managing the database, and ensuring smooth functionality. Key Responsibilities: Integration of Signup Process: Develop a custom signup form with new fields (phone number, DOB, alternative email). Implement validation checks for all fields, including new additions. Integrate Mailcow API to handle user registration and account creation. Ensure seamless communication between the frontend, backend, and database. Implementation of Login Process: Develop a secure login mechanism for users, considering new fields in the database. Integrate authentication with Mailcow/Sogo to validate user credentials, including additional fields. Implement error handling and session management for a seamless user experience. Password Reset Functionality: Develop a password reset feature al...

I'm looking for a full stack developer who can work comfortably on both the backend (Node.js) and frontend (React.js) of a web application. Key Requirements: - You should have solid experience with Node.js and React.js - You will be responsible for building the backend and frontend of the web application - The project does not require third-party integrations or APIs. - Previous experience in building web applications is a plus If you have the necessary experience and skills, I'd love to discuss this project with you. Please bid with your relevant experience and portfolios.

...platforms. The app will primarily offer ride-sharing services to users looking for shared transportation options. Key Features: - Real-time GPS Tracking: Users should be able to track their ride in real-time, ensuring transparency and safety. - In-App Payment: Seamless and secure payment options are essential to the success of the platform. - Rating and Reviews System: The app will need a feature that allows both drivers and passengers to rate and review one another, ensuring a reliable and trustworthy service. The ideal candidate for this project should have experience in: - Developing mobile applications for both iOS and Android. - Implementing real-time GPS tracking features within an app. - Integrating secure in-app payment gateways. - Creating user-friendly rating a...