Hello here is the link to api test with postman https://api.postman.com/collections/28488867-8ecfdeae-a396-4a55-a864-b8c59834e4a5?access_key=PMAT-01HJ67339PCRZQ8KR02HGBXEFQ
Please turgle the corresponding props in properties.application file to simulate successful or unsuccessful transaction method.
Also you can change the verious messages to change what payment instruction is sent to the user