Validate

post

https://sandbox.nmi.com/api/v5/payments/validate

Validate a payment method without processing a payment.

Recent Requests

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Never Use Real API Keys

Use Sandbox keys with the Try It feature. Do not enter production API keys when testing.

Body Params

Validate card, ACH, token, or wallet data. Optionally add the payment method to the customer vault.

payment_details

required

Payment method details. Exactly one variant: raw card data, ACH (check) data, payment_token, wallet payloads, or retail card-present data from a card reader. Do not combine fields from different variants.

customer_vault

object

Store the inline payment_details from this request in the customer vault.

industry

string

enum

Industry type for the transaction

Allowed:

signature_image

string

Base64 encoded signature image

billing_address

object

Billing address for a payment transaction request.

merchant_defined_fields

object

Custom fields configured in the merchant control panel under Settings → Merchant Defined Fields (field_1 through field_20).

Responses

401

Unauthorized

Never Use Real API Keys

200Success

400Bad Request - Validation Error