diff --git a/types.go b/types.go
index 1860cfa..e0e8edc 100644
--- a/types.go
+++ b/types.go
@@ -290,6 +290,7 @@ type (
 
 	// PaymentDefinition struct
 	PaymentDefinition struct {
+		ID                string        `json:"id,omitempty"`
 		Name              string        `json:"name,omitempty"`
 		Type              string        `json:"type,omitempty"`
 		Frequency         string        `json:"frequency,omitempty"`