Defines whether a credit card is required in order to book an appointment.

REQUIRE_CREDIT_CARD_UNSPECIFIED The credit card requirement is not explicitly specified and the behaviour is identical to the one specified for CONDITIONAL.
REQUIRE_CREDIT_CARD_CONDITIONAL Google will require a credit card for the booking if any of the following conditions are met: * the availability has a price and the prepaymentType is REQUIRED * the noShowFee is set * the deposit field is set.
REQUIRE_CREDIT_CARD_ALWAYS A credit card is always required in order to book this availability regardless of other field values.