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Before going live, you may test your integration with Sezzle using the Sezzle sandbox test environment, rather than the live production environment.
Only one environment’s dashboard session can be active at a time. If a user is logged in to production then logs in to sandbox on another tab, the production session will end, and vice versa.

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Accessing Sandbox Environments

  • A merchant who registers for a Sezzle production account automatically receives a matching sandbox account upon approval
    • Default admin users for the production dashboard are imported to the sandbox dashboard upon creation.
As with production, sandbox Admin users on can invite additional staff here.
  • Merchants can create a standalone sandbox account without a production account, ideal for testing production features without becoming a Sezzle merchant (e.g., during system integration)
    1. Sign up for Sandbox
      • Phone number and email address must be valid, all other information can be fake
    2. Complete email verification and security setup
    3. Complete Personal Information and Business Information sections of the Setup Checklist, then click Submit for Approval
      • This information can also be fake
      • In Production environment, Credit or Debit Card and Bank Account steps must also be completed before API keys can be generated.
    4. Contact your account manager or Sezzle Support for account approval
When starting with a standalone account, you must complete a Production merchant signup separately and manually. The two accounts will not be linked in these cases.

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Testing Your Integration

  1. Log in to your sandbox account
    • Production account users: Log in using the same credentials as production Merchant Dashboard
    • OTP will always be 123123 for Sandbox
  2. In the left toolbar, go to Settings > API Keys
  3. Click the button labeled create API key
    • API keys for sandbox and production are not interchangeable:
      • Sandbox API keys cannot be used in the production dashboard.
      • Production API keys cannot be used in the sandbox.
    • The sandbox gateway URL is https://sandbox.gateway.sezzle.com.
  4. Complete the Add Sezzle as a payment option at your checkout step of the setup checklist, enabling Test Mode
    • Bank account and currency settings can be skipped
  5. Start a checkout on your store website
  6. Select Sezzle as the payment method
  7. Complete the Sezzle checkout using the test data
  8. Verify that the order is successful
Refer to Postman Setup section on how to programmatically create orders and more leveraging Sezzle Core API.
If you wish to test widgets in Sandbox environment, you must use Production URL and merchant UUID. If you do not have a Production account, please contact Sezzle Support for options.