Hello there,
I have experience dealing with APIs and in past projects have dealt with Dropbox, Google API, Ebay, Zapier, to mention a few and am familiar with Authentication mechanism and data transfer between APIs. I am available to assist you in your requirements to develop the API interface, 1st through the sandbox environment provided, until approval by HMRC. Besides the mentioned details, I have used VBA extensively for data processing, analysis and automation of tasks, including integration of VBA with other Applications such as Word, Powerpoint, Outlook, generating PDFs, web scrapping, PDF data mining, Google Calendar, Gmail, Google Sheets and so on. I look forward to your response.
Moosa