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Deprecated: Use V3 Proto instead. Tokenization type of payment method saved with Google.

UNSPECIFIED_TOKENIZATION_TYPE Unspecified tokenization type.
PAYMENT_GATEWAY Use external payment gateway tokenization API to tokenize selected payment method.
DIRECT Directly return the encrypted payment method information to the merchant. The integrator will be responsible for parsing the data depending on the selected payment method and handling how to charge it.