Sage One Accounting API Integration in PHP

We are looking for a developer to build 4 pages of which they all run separate functions on the SAGE One API (No Design Required) . It's a relatively small task but we will have more similar work in the future so we it as the first job in a long term relationship. The SageOne API docs can be found at [login to view URL] and [login to view URL] We also have API endpoints and API keys For now we need a PHP function writing that will make the following calls in separate pages: - Create A Contact / Customer - Update A Contact / Customer - List All Purchase Invoices (for a given contact) - Create A Purchase Invoice (for a given contact) Please state in your proposal that you have read the API docs.