gst invoice for shopify website

hi, our website is [login to view URL] we are ecommerce company and i need GST invoice for our customer order. when we get the order - we want GST compliance order generate and available for download to customer in .pdf and admin can also download it. ref of invoice format : [login to view URL] please check with gst invoice u need to set also in product Edit : 1 : HSN Code 2 : TAX as per hsn code 3 : for admin also need : Total sale in excel / csv file which show Date / Order id / customer / customer address / product name / hsn / tax % / value / ship through / total amount. admin can see date wise / weekly / monthly / custom. available for download csv/excel file. it means tax is item based instead of default one tax of shopify. we need complete documentation and source code of this plugin. i need demo before award. thanks.