Whitelabel Master API key (WMAK) allows you to make API call on any bot connected to your Whitelabel. The WMAK can access all endpoints that a page token can access.
Making requests using WMAK is very similar to requests using account tokens.
Imagine this scenario:
Account ID: 0000
Account token: ppppp
Whitelabel Master key: wwww
1 – Making a request using the account token
1 – Making a request using the WMAK
You will need to add a parameter page_id to the request URL. Instead of using the page token, set the value of X-ACCESS-TOKEN to your WMAK. The same logic applies to all API requests.