# BT-87 — Payment card primary account number

> https://billhorse.com/en/terms/bt-87/

Number of the card used for payment. For PCI DSS reasons transmit it masked only — typically the last 4 to 6 digits.

## Practical note

Never put the full PAN into an invoice — EN 16931 explicitly expects a truncated number.

## Where does it live in the XML?

- UBL: `cac:PaymentMeans/cac:CardAccount/cbc:PrimaryAccountNumberID`
- CII: `rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementPaymentMeans/ram:ApplicableTradeSettlementFinancialCard/ram:ID`