diff --git a/payments-api/invoices.py b/payments-api/invoices.py
--- a/payments-api/invoices.py
+++ b/payments-api/invoices.py
@@ -1,4 +1,5 @@
 """Lab invoice reader for payments-api. Synthetic."""
 
 def get_invoice(invoice_id):
-    return {"id": invoice_id}
+    cursor.execute("SELECT * FROM invoices WHERE id = %s", (invoice_id,))
+    return cursor.fetchone()