# PAN Registration with Mastercard One Credential
source: https://developer.mastercard.com/account-catalog-services/documentation/use-cases/pan-registration/mc-one-cred-use-case/pan-reg-with-mc-one-cred/index.md

Mastercard One Credential enhancement will empower issuers to seamlessly manage multiple payment accounts by setting personalized business rules within their issuer's application, providing greater flexibility and control over their transactions. This is to offer issuers the functionality to maintain through their apps for debit, credit, prepaid, and instalment cards.  

Considering evolving market demands and consumer expectations are driving the need for greater flexibility in payment options. To address this, we aim to offer consumers a unified payment instrument for various transaction channels, such as POS and eCommerce, while enabling seamless switching between different payment accounts within the same issuer to fund transactions.

#### Following are the execution steps: {#following-are-the-execution-steps}

1. The customer provides PAN with the secondary PAN's to be associated for a PAN in Account Catalog Services through the API.
2. The Account Level Management (ALM) validates the PAN and the product, then registers the PAN in the system.
3. The API response is provided to customers with a registered product Rule Id, account category code, accept codes or reject codes as applicable.

## Sequence Diagram {#sequence-diagram}

Diagram pan-reg-with-mc1