A
AdyenAdyen 21
Not Submitted
Technical
System or connectivity issues
Retryable
This decline may succeed on retry
Description
The transaction was not submitted correctly for processing.
Recommended Action
Resubmit the transaction.
Common Causes
- Incomplete or malformed transaction data
- Integration issue
Recovery Tips
- Check the API request for missing or invalid fields
- Resubmit with corrected data
Quick Reference
Code
21
Category
Technical
Retryable
Yes
Source
Adyen
Related Decline Codes
2Retryable
Refused
The transaction was refused by the issuer without additional information.
3Retryable
Referral
The issuer requires a referral — typically a voice authorisation or manual review.
4Retryable
Acquirer Error
The transaction did not go through due to an error on the acquirer's end.
7Retryable
Invalid Amount
An amount mismatch occurred during the transaction process.
Adyen 21 recovery
Recover more payments like Adyen 21
Slicker handles codes like 21 by combining decline reason, issuer behavior, BIN data, and timing signals to choose the next best recovery action.
Analyze this in our payment data