API calls to real account instead of SOD tenant

Hi,

I have developed an API integration with SuperOffice in the developer portal (tenant Cust55171) at the endpoint https://sod3.superoffice.com/Cust55171/api/. Everything works correctly against this tenant.

Now, I want to connect the same API to the superoficce account I've actually been using the past years (Cust15673) at https://online4.superoffice.com/Cust15673/api/ so that I can access the real data. This account is at https://online4.superoffice.com/Cust15673/default.aspx?browser.extapp0.

My question is:

How do I register my integration/app so that when i make API calls to for example documents, I get the documents from the Cust15673 account?

Thank you in advance.