401 Unauthorized {"error":"invalid_client"}

We have generated API credentials as follows API User & API Key: https://mm.mtn.bj/partner/ subscription Key: https://momoapi.mtn.com/developer "Primary Key" from Profile section. When we're calling /token - POST API (https://proxy.momoapi.mtn.com/collection/token/) it gives us error "invalid_client". We also try the "Secondary Key"


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