diff --git a/manifest.json b/manifest.json
index 551e1cc..4e4e423 100644
--- a/manifest.json
+++ b/manifest.json
@@ -58,12 +58,21 @@
       {
         "url": "https://oauth.accounting.sage.com/.*",
         "methods": ["POST"],
-        "timeout": 20
+        "timeout": 20,
+        "settingsInjection": {
+          "client_id": {
+            "body": ["client_id"]
+          },
+          "client_secret": {
+            "body": ["client_secret"]
+          }
+        }
       },
       {
         "url": "https://api.accounting.sage.com/v3.1/.*",
         "methods": ["GET", "POST", "PUT"],
-        "timeout": 20
+        "timeout": 20,
+        "settingsInjection": {}
       }
     ]
   }
diff --git a/src/constants.ts b/src/constants.ts
index 571db5a..52c456c 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -21,7 +21,7 @@ export const placeholders = {
   REFRESH_TOKEN: `[user[${REFRESH_TOKEN_PATH}]]`,
   CLIENT_ID: "__client_id__",
   CLIENT_SECRET: "__client_secret__",
-};
+} as const;
 
 export const DEFAULT_ERROR = "There was an error!"