Build Xero Integration into Salesforce

Hi,

I have created most of the Object structure for Xero invoices/bills inside of Salesforce. I am looking for someone to build the API integration to connect to a Xero org directly.

This should mean invoices created in Salesforce are able to be synced to Xero and vice versa. Phase one would be to first deal with only:

1. Invoices (Bidirectional sync)
2. Invoice Credit Notes (Bidirectional sync)
3. Invoice Payments (Bidirectional sync)

Phase two would see:

1. Bills (Bidirectional sync)
2. Bill Credit Notes (Bidirectional sync)
3. Bill Payments (Bidirectional sync)

Useful resources for Quoting:
https://developer.xero.com/documentation/getting-started-guide/
https://github.com/benedwards44/Apex-for-Xero

Attached is a screenshot of the App and object structure I've built which is to facilitate the integration.