Build website and tools from API

We are using PortaOne system. We need someone to develop certain functions and deploy them through web or desktop application, using their offered XML API. The functions are mainly reports that should be given to resellers and customers, through a web interface or sent by email on daily basis. There would also be some automated process that retrieves information about account daily at a certain time, and stores the information in a database or sends them by email (will be decided depending on the data size). We also need to put together a website for end-users, that shows them information about their account, and includes an integration with 2CO as an online payment gateway. Priority would be given to persons who already have experience with Portaone and 2CO APIs.