diff --git a/types.go b/types.go
index af048e7..edeb0c5 100644
--- a/types.go
+++ b/types.go
@@ -1057,14 +1057,14 @@ type (
 
 	// PaymentSourceCard structure
 	PaymentSourceCard struct {
-		ID             string              `json:"id"`
-		Name           string              `json:"name"`
-		Number         string              `json:"number"`
-		Expiry         string              `json:"expiry"`
-		SecurityCode   string              `json:"security_code"`
-		LastDigits     string              `json:"last_digits"`
-		CardType       string              `json:"card_type"`
-		BillingAddress *CardBillingAddress `json:"billing_address"`
+		ID             string              `json:"id,omitempty"`
+		Name           string              `json:"name,omitempty"`
+		Number         string              `json:"number,omitempty"`
+		Expiry         string              `json:"expiry,omitempty"`
+		SecurityCode   string              `json:"security_code,omitempty"`
+		LastDigits     string              `json:"last_digits,omitempty"`
+		CardType       string              `json:"card_type,omitempty"`
+		BillingAddress *CardBillingAddress `json:"billing_address,omitempty"`
 	}
 
 	// PaymentSourcePaypal structure