diff --git a/openapi.yaml b/openapi.yaml
index e7a14f3..0df1304 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -8094,6 +8094,13 @@ paths:
           type: string
         description: Workspace unique_key
         required: true
+      - in: query
+        name: format
+        schema:
+          type: string
+          enum:
+          - json
+          - octet-stream
       - in: path
         name: id
         schema:
@@ -8109,27 +8116,37 @@ paths:
       responses:
         '200':
           content:
-            application/json:
+            application/octet-stream:
               schema:
-                $ref: '#/components/schemas/Envelope'
+                type: string
+                format: binary
           description: ''
         '401':
           content:
             application/json:
               schema:
                 $ref: '#/components/schemas/UnauthenticatedError'
+            application/octet-stream:
+              schema:
+                $ref: '#/components/schemas/UnauthenticatedError'
           description: ''
         '403':
           content:
             application/json:
               schema:
                 $ref: '#/components/schemas/ForbiddenError'
+            application/octet-stream:
+              schema:
+                $ref: '#/components/schemas/ForbiddenError'
           description: ''
         '404':
           content:
             application/json:
               schema:
                 $ref: '#/components/schemas/NotFoundError'
+            application/octet-stream:
+              schema:
+                $ref: '#/components/schemas/NotFoundError'
           description: ''
   /esign/envelopes/{id}/recipient/{recipient_id}/:
     put:
@@ -9291,6 +9308,7 @@ components:
               email_address:
                 type: string
                 format: email
+                minLength: 5
               country_code:
                 type: string
               phone_number:
diff --git a/src/api/services/EsignService.ts b/src/api/services/EsignService.ts
index 6900681..359ac16 100644
--- a/src/api/services/EsignService.ts
+++ b/src/api/services/EsignService.ts
@@ -258,23 +258,28 @@ export class EsignService {
 
     /**
      * preview Envelope
-     * @returns Envelope
+     * @returns binary
      * @throws ApiError
      */
     public static previewEnvelope({
         id,
+        format,
     }: {
         /**
          * A unique integer value identifying this envelope.
          */
         id: number,
-    }): CancelablePromise<Envelope> {
+        format?: 'json' | 'octet-stream',
+    }): CancelablePromise<Blob> {
         return __request(OpenAPI, {
             method: 'GET',
             url: '/esign/envelopes/{id}/preview/',
             path: {
                 'id': id,
             },
+            query: {
+                'format': format,
+            },
         });
     }