We need to integrate our PHP website with Xero via API

We have a requirement to link up our custom PHP website with Xero via an API. Our exiting developer who has build our website from scratch is not familiar with the Xero API so I am on the lookout for someone else, please kindly review our requirements and let me know if you can help...

We need a page creating in the front end of our system where users can click a link and it will open their invoice(s) (created and stored in Xero). The following info needs to be shown on this page/table:

1. Reference (From Reference field in Xero)
2. Amount (From Amount field in Xero)
3. Invoice (Clicking this will open the invoice in the browser)
4. Status (I.e. Paid OR Unpaid)
5. List of orders (Our existing developer can code this part)

I have made a mockup of roughly how it should look. Please see the attached PDF. Our existing developer should be able to customise the look so that it is the same as the rest of our site.

You should have knowledge of…

PHP
Xero API
Linking PHP websites with Xero via the API


What we need…

- Simple functions/classes that we can easily integrate into our PHP system.

- You should develop this as separate PHP file with functions and some examples, we will then integrate this into our system

Our existing developer says that you do not need to have access to our system or its data and that you should be able to work with some sample test data. You can use some existing PHP frameworks for Xero API to make this work.

Following on from this, there may be additional requirements and tasks you can work on relating to payments and the Xero API.

Please let me know any questions :)