diff --git a/manifest.json b/manifest.json
index ace0c7c..2d705f2 100644
--- a/manifest.json
+++ b/manifest.json
@@ -40,7 +40,19 @@
         "methods": ["GET", "POST", "DELETE"],
         "timeout": 20
       },
-      { "url": "https://zoom.us/oauth/.*", "methods": ["POST"], "timeout": 20 }
+      {
+        "url": "https://zoom.us/oauth/.*",
+        "methods": ["POST"],
+        "timeout": 20,
+        "settingsInjection": {
+          "client_id": {
+            "header": ["Authorization"]
+          },
+          "client_secret": {
+            "header": ["Authorization"]
+          }
+        }
+      }
     ]
   }
 }
diff --git a/src/constants.ts b/src/constants.ts
index 37b9e45..311947f 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -14,11 +14,6 @@ export const ACCESS_TOKEN = `[user[${ACCESS_TOKEN_PATH}]]`;
 export const REFRESH_TOKEN_PATH = "oauth/global/refresh_token";
 export const REFRESH_TOKEN = `[user[${REFRESH_TOKEN_PATH}]]`;
 
-export const placeholders = {
-  client_id: "__client_id__",
-  client_secret: "__client_secret__",
-};
-
 /** Zoom */
 export const REST_URL = "https://api.zoom.us/v2";