What causes the API call to return "AUTH_INVALID_USERNAME_OR_PASSWORD"? 【SOLARMAN Smart and Business】

What causes the API call to return "AUTH_INVALID_USERNAME_OR_PASSWORD"? 【SOLARMAN Smart and Business】

Please confirm the following: whether the API domain used for the interface is correct, whether the account information is correct, and whether the call format is correct. 
If you are unable to troubleshoot, please provide the API call details (URL, detailed input parameters) Submit a support ticket to contact us for assistance.