diff --git a/domains.yaml b/domains.yaml
index 6eef8b3..73ca004 100644
--- a/domains.yaml
+++ b/domains.yaml
@@ -299,9 +299,11 @@ components:
           format: int64
           type: integer
         digital_certificate_id:
-          format: int64
-          type: integer
           nullable: true
+          oneOf:
+            - type: string
+            - type: integer
+              format: int64
       required:
         - name
         - edge_application_id
@@ -326,10 +328,11 @@ components:
         edge_application_id:
           format: int64
           type: integer
-        digital_certificate_id:
-          format: int64
-          type: integer
-          nullable: true
+          oneOf:
+            - type: 'null'   # Note the quotes around 'null'
+            - type: string
+            - type: integer
+              format: int64
       type: object
     PutDomainRequest:
       additionalProperties: false
@@ -348,9 +351,11 @@ components:
           format: int64
           type: integer
         digital_certificate_id:
-          format: int64
-          type: integer
           nullable: true
+          oneOf:
+            - type: string
+            - type: integer
+              format: int64
       required:
         - name
         - edge_application_id
@@ -436,9 +441,11 @@ components:
           format: int64
           type: integer
         digital_certificate_id:
-          format: int64
-          type: integer
           nullable: true
+          oneOf:
+            - type: string
+            - type: integer
+              format: int64
         domain_name:
           type: string
         environment:
@@ -471,4 +478,4 @@ components:
       in: header
       description: |
         You must inform a token to auth.
-        Usage format: `Token <TOKEN>`
\ No newline at end of file
+        Usage format: `Token <TOKEN>`