Test Card Generator Skill

Overview

Card Generator works by generating valid test/sample card numbers based on the specified brand and count. It uses predefined rules and algorithms to generate the card numbers, then returns the list of generated card numbers in a structured format.

Live Test Test Card Generator Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as TestCardGeneratorSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

{
  "name": "TestCardGeneratorSkill",
  "arguments": {}
}

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

https://api.vervekit.com/v1/mcp

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

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{
  "status": "ok",
  "error": null,
  "data": {
    "brand": "visa",
    "count": 5,
    "cards": [
      {
        "cvv": 175,
        "issuer": "SOUTHEAST F.C.U.",
        "id": "0faca124-9a33-4ac6-a3df-8bf103025779",
        "number": "4750377207233152",
        "expiration": "12/2030",
        "brand": "visa",
        "number_alt": {
          "masked": "************3152",
          "unmasked": "4750 3772 0723 3152",
          "last4": "3152"
        }
      },
      {
        "cvv": 129,
        "issuer": "U.S. BANK, N.A.",
        "id": "0d074efe-69e2-4e30-b49a-4cead1ea8411",
        "number": "4431387818727358",
        "expiration": "12/2030",
        "brand": "visa",
        "number_alt": {
          "masked": "************7358",
          "unmasked": "4431 3878 1872 7358",
          "last4": "7358"
        }
      },
      {
        "cvv": 249,
        "issuer": "AUGUSTA VAH F.C.U.",
        "id": "2f01f458-7422-400e-bbcf-41364564193b",
        "number": "4425919427248836",
        "expiration": "12/2030",
        "brand": "visa",
        "number_alt": {
          "masked": "************8836",
          "unmasked": "4425 9194 2724 8836",
          "last4": "8836"
        }
      },
      {
        "cvv": 892,
        "issuer": "CITIZENS SECURITY BANK AND TRUST COMPANY",
        "id": "d311e9d0-f410-4f75-a21f-f14125c88cbb",
        "number": "4127737519045634",
        "expiration": "12/2030",
        "brand": "visa",
        "number_alt": {
          "masked": "************5634",
          "unmasked": "4127 7375 1904 5634",
          "last4": "5634"
        }
      },
      {
        "cvv": 524,
        "issuer": "CREDIT LIBANAIS S.A.L.",
        "id": "64113f4d-c625-43d2-9d82-04f220c9e26f",
        "number": "4741441509416816",
        "expiration": "12/2030",
        "brand": "visa",
        "number_alt": {
          "masked": "************6816",
          "unmasked": "4741 4415 0941 6816",
          "last4": "6816"
        }
      }
    ],
    "owner": {
      "name": "Benny Swaniawski",
      "address": {
        "street": "007 Nelson Mountains",
        "city": "Margueriteton",
        "state": "Washington",
        "zipCode": "39956-7950"
      },
      "avatar": "https://storage.googleapis.com/apiverve/APIResources/faces/Male/30-40/12345678.jpg?X-Goog-Signature=..."
    }
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Checkout UI Validation

Frontend developers mock form inputs with formatted unmasked card strings and expiration dates to test responsive payment component styling.

Staging Sandbox Transactions

When staging an ecommerce build, QA engineers submit generated card numbers and CVV codes to sandbox payment processors without exposing real credentials.

Receipt Layout Proofing

Designers populate order confirmation templates using masked card numbers and card brands to verify invoice rendering across email clients.

Form Auto-Formatting QA

Feed raw card numbers into billing inputs to verify that client-side scripts correctly format spacing and extract the last four digits.

Other ways to use Test Card Generator Skill

Set up Test Card Generator Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Related

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