All Cielo codes
CIELO · RETURN CODE

Cielo
U3

Not permitted: data validation failure. Review the data; if it persists check the store-to-Cielo communication.

Cielo saysIntegration issue
U3

Not permitted: data validation failure. Review the data; if it persists check the store-to-Cielo communication.

What it means

Invalid request data

A field in the request has a wrong value or format.

What to do

Compare the request with the provider's API reference. The response detail usually names the field.

Don't retry as-isWho can fix it: You, the merchant
Yuno response codeINVALID_PARAMETERS
Source:Cielo docs — Códigos de Retorno padrão ABECS (API E-commerce Cielo)

Other Cielo codes with the same meaning

HJIAKAKB

Reference only. Codes and descriptions come from each provider's public documentation. The Yuno response code is a reference mapping and does not guarantee how a specific transaction is processed.