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Testing Declined Transactions with Test Cards

When testing payment processing in Admoji, you can force a declined transaction by using CVV 999 on a card registered in your account's Test Cards list. This guide explains how to set up a test card and use it to simulate a declined transaction.

Important: CVV 999 only triggers a decline when the card number is registered in your account's Test Cards list. It will not work with arbitrary card numbers or gateway-specific test cards (e.g. Stripe, NMI, Braintree test cards).

Step 1: Add a Test Card to Your Account

Before testing, you need at least one card registered in your account's Test Cards list:

  1. Go to Settings, then click Account Settings.

  2. Navigate to the Test Cards tab.

  3. Click Add New. A drawer opens with three tabs of pre-suggested card numbers: Success, Declines, and Card Types. Select a card from any tab and click Save.

Add a Test Card to Your Account

Step 2: Use the Test CVV Values

When placing a transaction with one of your registered test cards, the CVV you enter controls the outcome:

  • CVV 999 → Transaction is Declined.

  • Any other CVV → Transaction is Approved.

CVV: 999

Step 3: Place the Test Transaction

You can use your test card and CVV 999 in the following ways:

  • Manual order entry: Go to For Customers, open a customer profile, click New Order, and on the Payment Info step enter your test card number and CVV 999.

  • API request: Include your test card number and CVV 999 in the cvv field of your transaction API request.