diff --git a/docs/openapi.yaml b/docs/openapi.yaml
index 72e41b1..9d35a53 100644
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@@ -754,11 +754,11 @@ paths:
             schema:
               type: object
               properties:
-                sender:
-                  description: Sender actor address (webfinger account URI).
+                sender_id:
+                  description: Sender ID.
                   type: string
-                  example: user@example.org
-                recipient:
+                  format: uuid
+                recipient_id:
                   description: Recipient ID.
                   type: string
                   format: uuid
diff --git a/src/mastodon_api/subscriptions/types.rs b/src/mastodon_api/subscriptions/types.rs
index 3e107c6..6880f93 100644
--- a/src/mastodon_api/subscriptions/types.rs
+++ b/src/mastodon_api/subscriptions/types.rs
@@ -7,8 +7,8 @@ use crate::models::profiles::types::PaymentOption;
 
 #[derive(Deserialize)]
 pub struct InvoiceData {
-    pub sender: String, // acct
-    pub recipient: Uuid,
+    pub sender_id: Uuid,
+    pub recipient_id: Uuid,
 }
 
 #[derive(Serialize)]
diff --git a/src/mastodon_api/subscriptions/views.rs b/src/mastodon_api/subscriptions/views.rs
index 99b3adf..056e67b 100644
--- a/src/mastodon_api/subscriptions/views.rs
+++ b/src/mastodon_api/subscriptions/views.rs
@@ -14,7 +14,7 @@ use crate::mastodon_api::accounts::types::Account;
 use crate::mastodon_api::oauth::auth::get_current_user;
 use crate::models::invoices::queries::create_invoice;
 use crate::models::profiles::queries::{
-    get_profile_by_acct,
+    get_profile_by_id,
     update_profile,
 };
 use crate::models::profiles::types::{
@@ -177,8 +177,8 @@ async fn create_invoice_view(
         .monero_config()
         .ok_or(HttpError::NotSupported)?;
     let db_client = &**get_database_client(&db_pool).await?;
-    let sender = get_profile_by_acct(db_client, &invoice_data.sender).await?;
-    let recipient = get_user_by_id(db_client, &invoice_data.recipient).await?;
+    let sender = get_profile_by_id(db_client, &invoice_data.sender_id).await?;
+    let recipient = get_user_by_id(db_client, &invoice_data.recipient_id).await?;
     let payment_address = create_monero_address(monero_config).await
         .map_err(|_| HttpError::InternalError)?
         .to_string();