To generate your Bearer token, you'll need your: 

• Username (Merchant code) 
• Password (Customer secret) 
• Jenga API Key  (See:Generating API Keys)

that you will pass in the Authorization header of your request.  

You will get a response back with your Bearer token (Bearer payment token). 

You can also refer to developer docs for guidance. 

Generate tokens with the endpoints attached. Please pick on the UAT columned endpoints for test and the production endpoints for the Live environment.