diff --git a/billing.go b/billing.go
index 292d56c..2ac4da1 100644
--- a/billing.go
+++ b/billing.go
@@ -22,6 +22,7 @@ type (
 
 	// CreateAgreementResp struct
 	CreateAgreementResp struct {
+		ID          string      `json:"id,omitempty"`
 		Name        string      `json:"name,omitempty"`
 		Description string      `json:"description,omitempty"`
 		Plan        BillingPlan `json:"plan,omitempty"`