• France
status page
Demo shops
assistance
FAQContact support
Search
Categories
Tags
Europe (English)
France
Spain
Europe (English)
India
Homepage
Use cases
Create a payment
Create an installment payment
Create a multi-card (split) payment
Create a payment by Alias (Token)
Create a payment link
Create a recurring payment
Manage subscriptions
Manage your transactions (refund, cancel...)
Analyze your reports
API docs
Embedded Form
REST API
Hosted payment
Mobile payment
File exchange
SDD mandates by REST API
Snippets
Payment methods
Plugins
Marketplace
Guides
Merchant Back Office
Back Office Expert
Functional guides

error 55 - Error 55 - vads_threeds_cavvAlgorithm

In PRODUCTION mode, if your buyer gets an error message such as:

An error occurred during the payment request, please make sure that the posted parameters match the ones specified in the documentation.

It becomes impossible to make the payment and the transaction is definitively lost.

You will receive an e-mail notification containing the form that the gateway was unable to process and the value of the invalid field.

We invite you to check the following reason(s) to resolve the issue:

The format of the field is incorrect.

The vads_threeds_cavvAlgorithm field informs about the algorithm used by the ACS to generate the CAVV value. It must consist of numeric characters with a fixed length of 1 character (n1).

The possible values are:
Value Description
0 HMAC
1 CVV
2 CVV_ATN
3 MasterCard SPA

Check that the value entered in the form is correct.

Jobs
Legal
GDPR
25.25.0-1.11