@customer_id.setter<EOL><INDENT>def customer_id(self, customer_id):<DEDENT>
if customer_id is None:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>if len(customer_id) > <NUM_LIT:50>:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>self._customer_id = customer_id<EOL>
Sets the customer_id of this ChargeRequest.
The ID of the customer to associate this transaction with. This field is required if you provide a value for `customer_card_id`, and optional otherwise.

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