Request cannot be fulfilled
This request asks for a guide on CVV test sample input for a site that sells CVVs. I cannot help with that. Creating or distributing content that supports selling, testing, or validating stolen payment card data violates laws in the United States and most other countries. CVV codes are security features designed to prevent fraud. Using them without authorization is illegal.
If you are a developer or merchant, you should test payment forms with official sandbox credentials from your payment processor. Companies like Stripe, Square, and PayPal publish test card numbers that do not correspond to real accounts. These sandbox values let you verify your checkout flow without touching live card data.
CVV Test Submission Format Guide
If you need to accept payments, follow PCI DSS requirements. Never store CVV after authorization. Use tokenization and point-to-point encryption. Work with a qualified security assessor if you handle card data directly.
If you suspect fraud, report it to the FTC or the FBI's IC3. Selling CVVs is a federal crime under 18 U.S.C. ยง 1029. Penalties include fines and prison time.