@application_id.setter<EOL><INDENT>def application_id(self, application_id):<DEDENT>
self._application_id = application_id<EOL>
Sets the application_id of this SourceApplication.
Read-only Square ID assigned to the application. Only used for [Product](#type-product) type `EXTERNAL_API`.

:param application_id: The application_id of this SourceApplication.
:type: str