diff --git a/ramp/src/types.rs b/ramp/src/types.rs
index caf4bd2..fcac467 100644
--- a/ramp/src/types.rs
+++ b/ramp/src/types.rs
@@ -7204,7 +7204,8 @@ pub struct Bill {
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub memo: Option<String>,
     #[doc = "Payment information of the bill."]
-    pub payment: ApiBillPayment,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub payment: Option<ApiBillPayment>,
     #[doc = "An ID that identifies the bill on client's side."]
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub remote_id: Option<String>,
@@ -7278,7 +7279,11 @@ impl tabled::Tabled for Bill {
             } else {
                 String::new().into()
             },
-            format!("{:?}", self.payment).into(),
+            if let Some(payment) = &self.payment {
+                format!("{:?}", payment).into()
+            } else {
+                String::new().into()
+            },
             if let Some(remote_id) = &self.remote_id {
                 format!("{:?}", remote_id).into()
             } else {
diff --git a/specs/ramp.json b/specs/ramp.json
index cc9a324..7d0c786 100644
--- a/specs/ramp.json
+++ b/specs/ramp.json
@@ -8198,7 +8198,8 @@
                 "$ref": "#/components/schemas/ApiBillPayment"
               }
             ],
-            "description": "Payment information of the bill."
+            "description": "Payment information of the bill.",
+            "nullable": true
           },
           "remote_id": {
             "description": "An ID that identifies the bill on client's side.",
@@ -8217,7 +8218,7 @@
             "description": "Vendor information of the bill."
           }
         },
-        "required": ["amount", "created_at", "due_at", "id", "issued_at", "payment", "status", "vendor"],
+        "required": ["amount", "created_at", "due_at", "id", "issued_at", "status", "vendor"],
         "type": "object"
       },
       "Business": {