diff --git a/packages/binding-http/src/credential.ts b/packages/binding-http/src/credential.ts
index 5388466a5..5d5a9500d 100644
--- a/packages/binding-http/src/credential.ts
+++ b/packages/binding-http/src/credential.ts
@@ -163,6 +163,18 @@ export interface TuyaCustomBearerCredentialConfiguration {
     secret: string;
 }
 
+interface TokenResponse {
+    success?: boolean;
+    result?: {
+        // eslint-disable-next-line camelcase
+        access_token?: string;
+        // eslint-disable-next-line camelcase
+        refresh_token?: string;
+        // eslint-disable-next-line camelcase
+        expire_time?: number;
+    };
+}
+
 export class TuyaCustomBearer extends Credential {
     protected key: string;
     protected secret: string;
@@ -201,17 +213,7 @@ export class TuyaCustomBearer extends Credential {
         if (refresh) {
             url = `${this.baseUri}/token/${this.refreshToken}`;
         }
-        const data: {
-            success?: boolean;
-            result?: {
-                // eslint-disable-next-line camelcase
-                access_token?: string;
-                // eslint-disable-next-line camelcase
-                refresh_token?: string;
-                // eslint-disable-next-line camelcase
-                expire_time?: number;
-            };
-        } = await (await fetch(url, request)).json();
+        const data: TokenResponse = await (await fetch(url, request)).json();
         if (data.success === true) {
             this.token = data.result?.access_token;
             this.refreshToken = data.result?.refresh_token;