@customer_id.setter<EOL><INDENT>def customer_id(self, customer_id):<DEDENT>
self._customer_id = customer_id<EOL>
Sets the customer_id of this Tender.
If the tender is associated with a customer or represents a customer's card on file, this is the ID of the associated customer.

:param customer_id: The customer_id of this Tender.
:type: str