Below are the list of common error you might see from the API response.
"message": "Error fetching access token"
User not authorized
Invalid input parameters or invalid input data
Invalid access token
The token might have expired or an invalid token
The license key is not registered for this domain, please associate this domain for the purchases license by login to your account.
The session key provided might have expired, please get a new session key using Session API. Note: A session key is valid for 24hours.
The service name passed is not correct, please refer the Supported Service page
Invalid License Key
The License key provided is invalid
This service is not available in your plan
The service requested to import contacts is not available in the purchased plan. Please purchase the required plan for this service and try again.
Check if you are passing all the input parameters as per the documentation
Check if you are passing the session value as part of the Header. Note: Session is received from Session API
Invalid redirect url
The provided redirect url might not matched with the redirect url provided in the APP configuration.
Error occurred while fetching access token
The provided access token or code, token secret, token verifier could be wrong.
Error occurred while fetching contacts
Something went wrong
Error occurred during the operation