The MpesaFlow API uses API keys to authenticate requests. You can view and manage your API keys in API Keys paage in the MpesaFlow Dashboard. You can view and manage your API Keys on the API Keys page in the MpesaFlow Dashboard.
Api Key Page
Development API keys have the prefix mf_test_ and Production API keys have the prefix mf_live_. Authentication to the API is performed via the Authorization header with a Bearer token. To authenticate, you need to include the Authorization header with the word Bearer followed by your token in your API requests like so: 
Authorization: Bearer mf_test_1234567890