Testing Your Integration

Before going live, use the Cost+ test environment to verify your integration works correctly.

Getting Your API Credentials

1. Log in to the Cost+ admin portal.
2. Navigate to Settings > API Key.
3. Copy your API key.

[!NOTE] Test mode is indicated by the active-testing status on your account. All transactions made in test mode are simulated and will not process real payments.

Creating Test Projects

Create a test project via the API to isolate your testing activity:

curl -u YOUR_API_KEY: \
  -X POST \
  -H "Content-Type: application/json" \
  https://api.costplus.online/v1/merchants/self/projects/

Test Card Numbers

Use the card numbers below to simulate different payment scenarios. Do not use real card numbers in test mode.

Shift4 Test Cards

[!TIP] For Challenge flow cards, the codes listed are the one-time passwords to enter during 3D Secure authentication. Use the success code to simulate a successful payment or the fail code to simulate a declined payment.

Rapyd Test Cards

[!WARNING] Test card numbers only work against the test environment. Submitting them to the live API will result in a declined transaction.