Create or update organization credentials for a connector.

Name of the credentials. Use this name to access or modify your credentials.

Human-readable title for the credentials.

Controls whether this credential is the default for its auth method. On creation: if no credential exists yet for this auth method, the credential is automatically set as default when is_default is true or omitted; setting is_default to false is rejected because a default must exist. If other credentials already exist, setting is_default to true promotes this credential (demoting the previous default); false or omitted creates it as non-default. On update: true promotes this credential, false is rejected if it is currently the default (promote another credential first), omitted leaves the default status unchanged.