diff --git a/spec/definitions/BankCardDetails.yaml b/spec/definitions/BankCardDetails.yaml
index 7f87fdc..b78de67 100644
--- a/spec/definitions/BankCardDetails.yaml
+++ b/spec/definitions/BankCardDetails.yaml
@@ -6,6 +6,10 @@ properties:
     description: Маскированый номер карты
     type: string
     pattern: '^\d{2,4}$'
+  bin:
+    description: BIN банка-эмитента карты
+    type: string
+    pattern: '^\d{6,8}$'
   paymentSystem:
     x-rebillyMerge:
       - $ref: '#/definitions/BankCardPaymentSystem'