---
description: Understand Mastercard issuer response code 55 (Invalid PIN). Learn why this decline happens, how to handle PIN entry errors, and when to prompt customers.
title: Mastercard Decline Code 55: Invalid PIN
image: https://cdn.smartretry.com/cdn-cgi/image/width=1200,height=630,quality=85,fit=cover/https%3A%2F%2Fcdn.smartretry.com%2F_next%2Fstatic%2Fmedia%2Fog-image.0z0q4_5kazzzo.jpeg
---

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Mastercard

# Mastercard Issuer Response Code 55: Invalid PIN

soft decline

Last updated: September 25, 2026

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Table of Contents

## About 55 \- "Invalid PIN"

## Key details

Brand

![Mastercard](https://cdn.smartretry.com/cdn-cgi/image/width=256,quality=75,format=auto,fit=cover/https%3A%2F%2Fcdn.smartretry.com%2Fpayment-providers%2Flogos%2Fmastercard.svg)

Code

55

Category

Issuer Response Codes

Response

55

Detailed Response

Invalid PIN

soft decline

## What it means

Mastercard issuer response code 55 indicates that the transaction was declined because the customer entered an incorrect Personal Identification Number (PIN). The issuing bank successfully reached the account but blocked the transaction due to the PIN mismatch. It serves as a prompt for the cardholder to correct their entry before they exceed the issuer's allowed attempt limit.

## Classification & retryability

softRetryable: conditional

Do not automatically retry the same transaction data. A retry will only succeed if the customer actively re-enters the correct PIN at the terminal. If PIN entry is not possible, request an alternate payment method.

## Why does code 55 occur?

* The cardholder accidentally mistyped their PIN on the terminal or point-of-sale device.
* The customer has forgotten their correct PIN and guessed incorrectly during checkout.
* A merchant integration or hardware defect incorrectly passed malformed or encrypted PIN block data to the issuer.

## How to solve 55?

For attended point-of-sale transactions, prompt the customer to re-enter their PIN carefully. If they cannot remember the correct PIN, advise them to use an alternative payment method and contact their issuing bank. For card-not-present or recurring online transactions where you cannot collect a PIN, do not attempt automated retries; instead, contact the customer to update their payment details.

### Solving as a merchant

Halt automated retries immediately to prevent triggering a hard block for exceeded PIN attempts (such as code 75). Ensure your POS or terminal software clearly displays a 'Wrong PIN' message to the shopper, allowing them a chance to try again safely. If the transaction channel does not support PIN entry, flag the failure and prompt the user for a new payment method.

### Solving as a customer

Carefully re-enter your PIN on the terminal pad. If you have forgotten your PIN, use a different credit or debit card to complete the purchase, and contact your issuing bank to request a PIN reset.

💡Tip from SmartRetry Suppress automated retries immediately to avoid triggering issuer PIN lockouts on the customer's card. If processing online debit, evaluate whether your gateway supports routing transactions through PINless rails rather than resubmitting the same credential payload.

[See the full list of Mastercard's decline codes \>](/payment-providers/mastercard#statuses)[Find code on Mastercard's website \>](https://developer.mastercard.com/payment-initiation-api/documentation/code-and-formats/)

### Frequently asked questions about this topic

Can I automatically retry a Mastercard code 55 decline?

No. Code 55 requires the customer to provide the correct PIN. An automated retry with the exact same authorization data will fail and may cause the issuer to permanently lock the card for exceeding allowed PIN attempts.

How is code 55 different from code 75?

Code 55 simply means the PIN entered for the current transaction is incorrect. Code 75 ('PIN Tries Exceeded') indicates the account or card is now locked because the user has failed too many consecutive PIN attempts, sometimes accumulating across multiple transactions.

What should I do if I receive code 55 on a recurring online payment?

Because you cannot collect or verify a PIN in a card-not-present recurring transaction, you must contact the customer and request an alternate payment method. Attempting to force the transaction through without a valid PIN will continue to result in a failure.

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Author

##### Kyle Regacho

[![LinkedIn](https://cdn.smartretry.com/cdn-cgi/image/width=32,quality=75,format=auto,fit=cover/https%3A%2F%2Fcdn.smartretry.com%2F_next%2Fstatic%2Fmedia%2Flinkedin.09sdc8tnlrn4a.svg)Find me on Linkedin](https://www.linkedin.com/in/kdregacho/)

Focused on payment recovery, decline codes, and authorization optimization at SmartRetry. Helps payment teams turn failed transactions into recovered revenue

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## Related codes

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