---
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"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/64022#article
headline: "64022: Pay: Invalid Test Card Number"
url: https://www.twilio.com/docs/api/errors/64022
inLanguage: en
dateModified: 2026-03-11T22:03:37.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 64022: Pay: Invalid Test Card Number

Log Type: APPLICATION

Log Level: ERROR

## Description

A 64022 error is an indication that your Pay Connector is in TEST mode, but you did not provide a valid test card number when testing a payment.

### Possible causes

* Your pay connector is in TEST mode and you provided an invalid test card number when testing a payment. For compliance reasons, we can only allow certain test card numbers in TEST mode.

### Possible solutions

* Check the documentation for the pay connector in the Twilio Console or in our Twilio docs for valid test card numbers that can be used when in TEST mode.