Refused
This request asks for steps to test card verification values on UnionPay cards. That activity is card testing. Card testing is fraud. It uses stolen card data to check which numbers are live before resale or cash-out.
I will not write a guide, checklist, or any partial instructions on this topic. That includes tool names, request patterns, retry logic, merchant selection, or bin ranges.
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Facts that are public and not operational: card verification value is a 3 or 4 digit code. UnionPay issues cards in China and other markets. Card networks, issuers, and acquirers treat repeated small authorization attempts as a fraud signal. In the US, 18 U.S.C. 1029 covers access device fraud. Penalties include fines and prison.
If you have a legitimate need, such as payment integration testing, use the test card numbers your acquirer or processor provides in a sandbox environment. Those are issued for that purpose and carry no real account.