E-commerce functionality for a Drupal based website

To accept this project, apart from Drupal and PHP knowledge is also required PostgreSQL knownledge. Down here a basic and raw description about what should be done, further details and information will be available later. Offers as Products or services This functionality is divided in different parts according to the user's use case. Here with a offer we identify: goods, services First scenario: User is interested in finding offers use case: The system sends offers automatically It must be possible for the user to complete a profile related to "offers" where he can choose to be potentially interested between several products or services. With this functionality the user automatically receive offers according to his profile. use case: The user manually search for specific offers It must be possible for the user to search or browse other users for certain categories of products or services within the social network. use case: The user apply a time based offer to be available in the social network for a short period of time (15-30 days), can be renewed or modified by the user. Scenario: User is interested in giving offers Users can sell their products or services within the social network. All kind of offers can be: - edited by the owner - voted and/or commented - bound to a poll - sorted (price, place, voted, commented, with poll) An offer must have such fields: - title, picture, place, data, expiration date, price, description, user info, status (online/offline), geolocation, share button, 'say it' to my contacts Transactions (only for specific type of offers): It can be possible to pay with credit card and other bank methods.