diff --git a/openapi/src/main.rs b/openapi/src/main.rs
index 3f217f36..aea1a408 100644
--- a/openapi/src/main.rs
+++ b/openapi/src/main.rs
@@ -316,6 +316,9 @@ fn gen_impl_object(meta: &Metadata, object: &str) -> String {
         if let Some(doc) = schema["properties"]["id"]["description"].as_str() {
             print_doc_comment(&mut out, doc, 1);
         }
+        if id_type == "InvoiceId" {
+            out.push_str("    #[serde(default = \"InvoiceId::empty\")]");
+        }
         out.push_str("    pub id: ");
         out.push_str(&id_type);
         out.push_str(",\n");
diff --git a/src/ids.rs b/src/ids.rs
index 9a33b1b5..26f3a034 100644
--- a/src/ids.rs
+++ b/src/ids.rs
@@ -528,6 +528,12 @@ def_id!(TransferId, "tr_");
 def_id!(TransferReversalId, "trr_");
 def_id!(WebhookEndpointId, "we_");
 
+impl InvoiceId {
+    pub(crate) fn empty() -> Self {
+        Self("".into())
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/resources/invoice.rs b/src/resources/invoice.rs
index 28fc7e55..4205d87d 100644
--- a/src/resources/invoice.rs
+++ b/src/resources/invoice.rs
@@ -17,6 +17,7 @@ use serde_derive::{Deserialize, Serialize};
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Invoice {
     /// Unique identifier for the object.
+    #[serde(default = "InvoiceId::empty")]
     pub id: InvoiceId,
 
     /// The country of the business associated with this invoice, most often the business creating the invoice.