Short answer
"CVV test tokenization v4" is not a term in any published payment standard. It joins three separate items: test data, tokenization, and a version number. Processors attach version numbers to their tokenization APIs. The CVV is not part of the token in any of those APIs.
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What tokenization replaces
Tokenization swaps the 16-digit primary account number for a surrogate value. The token moves through the merchant system. The real PAN stays in a vault. Card networks run their own systems: Visa Token Service and Mastercard Digital Enablement Service. EMVCo publishes the tokenisation specification that those networks build on.
Where the CVV fits
The CVV is sensitive authentication data under PCI DSS. Requirement 3.2 states that sensitive authentication data is not stored after authorization. That data set covers the full magnetic stripe, the card verification code, and the PIN block. A token vault holds the PAN and the expiry date. The CVV is not stored with it.
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Networks answer the verification problem with a per-transaction cryptogram. Visa Token Service sends a token cryptogram. EMV 3-D Secure sends a CAVV. Both values are single use. Neither value can be replayed.
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What test tokenization covers
Sandbox environments accept test card numbers. The processor returns a token. The response holds no CVV field. Test suites check token creation, token reuse, cryptogram validation, and error paths such as an expired token or a mismatched cryptogram.
Processors publish their own test values. Stripe, Adyen, and Braintree each run a test mode with fixed card numbers and fixed CVV responses. A failed CVV test returns a named decline code.
What "v4" can mean
The number marks an API revision on the processor side. It is not a global standard. Two processors can ship a "v4" token endpoint with different request fields. Read the API reference for the account in use.
Checks before integration
- Confirm the endpoint version in the current API reference.
- Confirm the vault never receives a CVV.
- Confirm test keys and production keys are separate.
- Confirm logs redact PAN and CVV fields.
Unknown: no public document defines "cvv test tokenization v4" as a named specification. Vendor documentation is the source.