Multi-network tokenization processing

A token requestor computer comprising:

• a processor;
• and
• a non-transitory computer-readable storage medium comprising code executable by the processor for implementing a method comprising:
• receiving a token and transaction data for a transaction associated with an account;
• generating an authorization request message for the transaction including the token and the transaction data;
• transmitting the authorization request message to a first payment network server computer associated with a first payment network, thereby causing the first payment network server computer to:
• identify a network token system associated with the token based on a predetermined issuer identifier of the token, the network token system being operated by a second payment network,
• send a token verification request message to the network token system of the second payment network, the token verification request message including the token and the transaction data, wherein the network token system of the second payment network determines a primary account identifier associated with the token and validates the use of the token for the transaction,
• receive a token verification response message including the primary account identifier and a validation result, and
• send a modified authorization request message including the primary account identifier, the validation result, and the transaction data to an issuer of the account;
• and
• receiving an authorization response message including an authorization decision for the transaction, wherein the authorization decision is based on the modified authorization request message.