---
updatedAt: 2026-07-17T22:07:56.000Z
agentTools:
  projectIndex: https://docs.nmi.com/llms.txt
---

# Testing - Sandbox

Testing Values for Payer Authentication

The following test cards simulate example authentication scenarios in **Sandbox**. We recommend running these scenarios before going live to ensure your integration is successful and accurate.

If you do not have your Sandbox credentials, login to <Anchor label="guide.nmi.com" target="_blank" href="https://guide.nmi.com/">guide.nmi.com</Anchor> to access your Sandbox API Keys and your Sandbox Partner and Merchant Portals.

# "Not Enrolled" Frictionless Flow

These cards will return `Enrolled: "N"` and trigger a frictionless flow where the card is not enrolled in 3DS:

* **Visa**: `4111111111111111`
* **Mastercard**: `5431111111111111`
* **Amex**: `341111111111111`
* **Discover**: `6799990100000000019`

**Expected Result:**

* `cardholder_auth` = 'attempted'
* `CAVV` = empty
* `ECIFlag` = "07" (Not enrolled)

# "Frictionless Authentication" Flow

These cards will return `Enrolled: "Y"` with a `CAVV` present, simulating silent authentication:

* **Visa**: `4100000000000100`
* **Mastercard**: `5100000000000107`
* **Amex**: `340000000000108`
* **Discover**: `6440000000000104`

**Expected Result:**

* `cardholder_auth` = 'verified'
* `CAVV` = mock value (e.g., "mock\_cavv\_0002\_1234567890")
* `ECIFlag` = "05" (Authenticated)

# Challenge Flow Test Cards

These cards will trigger a 3DS challenge flow requiring user interaction:

* **Visa**: `4100000000005000`
* **Mastercard**: `5100000000005007`
* **Amex**: `340000000005008`
* **Discover**: `6440000000005004`

**Expected Result:**

* `Enrolled: "Y"`
* `PAResStatus: "C"` (Challenge required)
* `ECIFlag: "02"` (Challenge required)
* User will be presented with a mock challenge interface. Use the following actions to trigger each result:

| Result | Description                                                              | Action                          |
| :----- | :----------------------------------------------------------------------- | :------------------------------ |
| Pass   | Receive a successful step-up authentication response                     | Enter code **12345**            |
| Fail   | Receive a failed step-up authentication response                         | Enter any code other than 12345 |
| Cancel | Close challenge to receive an incomplete step-up authentication response | Select **Cancel**               |