diff --git a/openapi.yml b/openapi.yml
index 19a8bef..11ea81a 100644
--- a/openapi.yml
+++ b/openapi.yml
@@ -22,6 +22,8 @@ tags:
     description: ""
   - name: signing-request
     description: ""
+  - name: signing-request-document
+    description: ""
 
 paths:
   /hello:
@@ -69,6 +71,33 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/ErrorResponse"
+  /signing-request-document/{id}/data:
+    get:
+      tags:
+        - signing-request-document
+      summary: Get the file data of a signing request document
+      operationId: getSigningRequestDocumentData
+      parameters:
+        - name: id
+          in: path
+          required: true
+          description: The ID of the signing request document
+          schema:
+            type: string
+      responses:
+        200:
+          description: "Signing request document file data was found"
+          content:
+            application/pdf:
+              schema:
+                type: string
+                format: binary
+        404:
+          description: "Signing request document file data was not found"
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ErrorResponse"
 
   /token:
     post: