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 Generate Test Cards Source →
Formula
One function covers the whole catalog: the first argument names the source, the rest are its inputs, and the "field" pair says which single value lands in the cell. Formulas covers the grammar that applies to all of them.
=VERVE("cardgenerator", "field", "cards.0.cvv")=VERVE.CALL("cardgenerator", "field", "cards.0.cvv")Inputs
Required inputs are positional, in the order below. Everything else is passed as a "name", value pair after them — the same shape as SUMIFS. Premium inputs are accepted on every plan but only take effect on plans that include them.
| Input | Type | Where it goes | Description |
|---|---|---|---|
brandOptional | string | "brand", value | The brand of the card to generatevisamastercardamexdiscoverjcbdinersunionpaydefault visa |
countOptionalPremium | integer | "count", value | The number of test card numbers to generate default 1 · range 1–50 |
includeAvatarOptionalPremium | boolean | "includeAvatar", value | Include an AI-generated face avatar for the card owner |
Passing an option
=VERVE("cardgenerator", "brand", "visa")=VERVE.CALL("cardgenerator", "brand", "visa")What lands in your sheet
The "field" pair is what makes the formula resolve to one cell. Its value is a dot-path from the table below, so swapping it is how you pull a different value — one formula per column.
Seeing everything at once
Drop the "field" pair and the formula returns the whole response instead: two columns, field name on the left and value on the right, spilling from the cell you typed in.
=VERVE("cardgenerator")=VERVE.CALL("cardgenerator")The second row's table would land on top of the first's, and every cell after the first reads #REF! (#SPILL! in Excel). Keep one per sheet, or name a field, and leave the cells below and to the right empty.
Response fields
Paths are relative to data. Each one is exactly what the "field" pair accepts, so swapping it is how you pull a different value into a cell. On a plan without a Premium field the cell reads #PREMIUM(field) rather than a value, so a locked field never looks like a real answer.
| Use as "field" | Type | Example cell value | Description |
|---|---|---|---|
brand | string | visa | Card brand for generated test cards |
count | number | 5 | Total number of generated test cards |
cards | array[5] | Array of generated test card objects with details | |
cards.0.cvv | number | 175 | Card verification value security code |
cards.0.issuer | string | SOUTHEAST F.C.U. | Financial institution that issued the card |
cards.0.id | string | 0faca124-9a33-4ac6-a3df-8bf103025779 | Unique identifier for generated card |
cards.0.number | string | 4750377207233152 | Full test card number for payment testing |
cards.0.expiration | string | 12/2030 | Card expiration date in MM/YYYY format |
cards.0.brand | string | visa | Card brand identifier (visa, mastercard, etc) |
cards.0.number_alt | object | {…} | |
cards.0.number_alt.masked | string | ************3152 | Card number with asterisks masking sensitive digits |
cards.0.number_alt.unmasked | string | 4750 3772 0723 3152 | Card number formatted with spaces for readability |
cards.0.number_alt.last4 | string | 3152 | Last four digits of card number |
ownerPremium | object | {…} | Cardholder owner information and address details |
owner.namePremium | string | Benny Swaniawski | Full name of the card owner |
owner.addressPremium | object | {…} | |
owner.address.streetPremium | string | 007 Nelson Mountains | Street address of card owner |
owner.address.cityPremium | string | Margueriteton | City of card owner residence |
owner.address.statePremium | string | Washington | State of card owner residence |
owner.address.zipCodePremium | string | 39956-7950 | Postal zip code of card owner |
owner.avatarPremium | string | https://storage.googleapis.com/apiverve/APIResources/faces/Male/30-40/12345678.jpg?X-Goog-Signature=... | URL to AI-generated face avatar image |
When a cell doesn't fill
A failed lookup returns readable text starting with #ERR rather than a spreadsheet error, because Excel cannot show a custom message on a real error — you would get a bare #VALUE! with no reason. The trade-off is that IFERROR() will not catch it; test with LEFT(cell, 4) = "#ERR" instead. Error handling covers the rest.
| Cell reads | What happened |
|---|---|
#ERR Not connected | No API key saved. Open the side panel and connect your account. |
#ERR Replace <name> with a cell or value | A preview formula was copied as-is. Swap the placeholder for a cell reference. |
#ERR No "x" in cardgenerator | An option name this source does not take. The message lists the ones it does. |
#ERR No data point "…" | The "field" path is not in the response. Check it against the table above. |
#PREMIUM(field) | The field exists but your plan does not include it. |
#ERR Out of credits | The cycle's credits are spent. Usage resets on your billing date. |
Before the formula works
The add-in reads the API key you saved once in the side panel — the key never goes in the formula, so a shared sheet does not leak it and a collaborator without access simply sees the last calculated values.
- Install the add-in for Google Sheets or Excel.
- Open the side panel and sign in, or paste a key from your dashboard.
- Type the formula above into any cell.
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 Generate Test Cards
Set up Generate Test Cards on VerveSheets, or reach the same source a different way. Your VerveSheets account and credits work on all of them — one key, one balance.
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