Why am I getting an 'OAUTH_SCOPE_MISMATCH' error for the POST or for method calls other than GET for my third party application while generating a token through the Connectors?

In Catalyst Connectors, this error will occur if you do not include proper scopes for the POST operation or for other operations while generating the grant token (code) that you use for the connector. Generate the grant token by adding the required scopes for all the operations you are going to perform, and then use the new token for the operations.