https://test.salesforce.com/services/oauth2/token?grant_type=client_credentials&client_id=XXXXXXXXXXXXXXXXX&client_secret=XXXXXXXXXXXXXXX

https://test.salesforce.com/services/oauth2/token?grant_type=password&client_id=3MVG9lcxCTdG2Vbs7E5OwQecRVkliAxcnCh4dEoJtZfP1P.5Wb5n8IFFP69b.SJ2faiw4_jh1&client_secret=370769049890&username=username@test.com&password=237857235237645


{
    "error": "invalid_grant",
    "error_description": "authentication failure"
}