Drupal Forms

I have a Drupal site that needs development of custom module for processing information and payment from a category of users. Information from the users will be processed and stored by way of forms and payments will be made by interfacing to a payment platform from a web api that will be provided. The attached zip file contains the following: jpg files describing the logical process flow of how this module should work for 2 types of users: contractors and students. word documents with a description of the fields required for the various forms to be designed. A pdf file describing the web api.