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To test an in-person payment you need a Dintero payment terminal in the sandbox and something to tap against it. Instead of a stack of physical test cards, use the Visa CDET (Contactless Device Evaluation Toolkit) Android app — it turns your phone into a contactless test card and lets you exercise different card profiles and edge cases.
CDET is a Visa-published tool intended for testing only. Use it against terminals that are configured for the sandbox environment, never against production terminals.

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What you need

  • An Android device with NFC.
  • A Dintero payment terminal registered to a store in the sandbox. See terminal onboarding.
  • The ability to change the phone’s default wallet / contactless payment app.

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Install the Visa CDET app

Install Visa CDET Application from the Google Play Store:

Visa CDET on Google Play

com.visa.app.cdet

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Set CDET as the default wallet app

For the terminal to talk to CDET instead of Google Wallet (or any other wallet), you need to make CDET the default contactless payment app on the phone.
1

Open the NFC / wallet settings

On your Android device, open Settings and search for Default wallet app (sometimes under Connected devices > NFC > Contactless payments). The exact path varies by manufacturer.
2

Select CDET 1.22

Choose CDET 1.22 from the list of installed wallet apps.Selecting CDET 1.22 as the default wallet app in Android settings
Remember to switch the default back to your normal wallet app when you’re done testing, otherwise real contactless payments from the phone will stop working.

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Test cards

Open the Visa CDET Application. You’ll see a list of test cards, each modelling a specific card profile or edge case (baseline VCPS compliance, unusual PDOL requests, multi-application cards, missing cardholder name, and so on). List of CDET test cards with different behaviours Select the card that matches the scenario you want to test, then tap the phone against the terminal when it prompts for payment. Refer to the card description shown in the app for the exact behaviour of each entry — the list is maintained by Visa and updated with each CDET release.

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Run a sandbox payment

1

Create a terminal session

Create a session that targets your sandbox terminal. See creating a terminal session.
2

Tap the phone against the terminal

When the terminal prompts Tap, insert, or swipe, hold the phone (with CDET set as the default wallet and the desired card selected) against the terminal’s contactless zone.
3

Observe the result

The terminal completes the flow as if a real Visa card were tapped. The resulting transaction shows up in Backoffice and via the standard Checkout API, so you can verify authorization, capture, and callback handling end-to-end.

Onboard a terminal

Register a store and link a terminal before you start testing.

Create a terminal session

Build the session payload that drives the terminal.
Last modified on August 27, 2026