diff --git a/pomelo/api/transactions/authorizations.ts b/pomelo/api/transactions/authorizations.ts
index 0d8e6304..98ba3aac 100644
--- a/pomelo/api/transactions/authorizations.ts
+++ b/pomelo/api/transactions/authorizations.ts
@@ -25,7 +25,7 @@ export default async function authorizations(request: VercelRequest, response: V
     return response.status(403).end("forbidden");
   }
 
-  const parsed = authorizationRequest.safeParse(raw);
+  const parsed = authorizationRequest.safeParse(JSON.parse(raw));
 
   if (parsed.success) {
     const tx = await processTransaction(parsed.data);
diff --git a/pomelo/utils/buffer.ts b/pomelo/utils/buffer.ts
index 0c3e7252..beebd636 100644
--- a/pomelo/utils/buffer.ts
+++ b/pomelo/utils/buffer.ts
@@ -1,9 +1,11 @@
 import type { Readable } from "node:stream";
 
-export default async function buffer(readable: Readable) {
-  const chunks = [];
-  for await (const chunk of readable) {
-    chunks.push(typeof chunk === "string" ? Buffer.from(chunk) : chunk);
-  }
-  return Buffer.concat(chunks);
+export default function buffer(request: Readable): Promise<Buffer> {
+  return new Promise((r) => {
+    const chunks: Buffer[] = [];
+    request.on("data", (chunk: Buffer | string) => chunks.push(Buffer.from(chunk)));
+    request.on("end", () => {
+      r(Buffer.concat(chunks));
+    });
+  });
 }
diff --git a/pomelo/utils/verify.ts b/pomelo/utils/verify.ts
index ce9ec9c1..e40fa5a7 100644
--- a/pomelo/utils/verify.ts
+++ b/pomelo/utils/verify.ts
@@ -15,11 +15,11 @@ export function verifySignature(request: VercelRequest, body: string) {
   let signature = request.headers["x-signature"];
   const apiKey = request.headers["x-api-key"];
 
-  if (!valid(endpoint) || !valid(timestamp) || !valid(apiKey) || Array.isArray(apiKey) || !valid(signature)) {
+  if (!valid(endpoint) || !valid(timestamp) || !valid(apiKey) || !valid(signature)) {
     return false;
   }
 
-  if (!POMELO_API_KEY) return false;
+  if (apiKey !== POMELO_API_KEY || !POMELO_API_SECRET) return false;
 
   if (signature.startsWith("hmac-sha256")) {
     signature = signature.replace("hmac-sha256 ", "");
@@ -28,7 +28,7 @@ export function verifySignature(request: VercelRequest, body: string) {
   }
 
   const hmac = crypto
-    .createHmac("sha256", Buffer.from(POMELO_API_KEY, "base64"))
+    .createHmac("sha256", Buffer.from(POMELO_API_SECRET, "base64"))
     .update(timestamp)
     .update(endpoint)
     .update(body);
@@ -47,11 +47,11 @@ export function signResponse(request: VercelRequest, response: VercelResponse, t
     return response.status(400).end("bad request");
   }
 
-  if (!POMELO_API_KEY) return response.status(500).end("internal server error");
+  if (apiKey !== POMELO_API_KEY || !POMELO_API_SECRET) return response.status(500).end("internal server error");
 
   const timestamp = Math.floor(Date.now() / 1000).toString();
 
-  const hmac = crypto.createHmac("sha256", Buffer.from(POMELO_API_KEY, "base64")).update(timestamp).update(endpoint);
+  const hmac = crypto.createHmac("sha256", Buffer.from(POMELO_API_SECRET, "base64")).update(timestamp).update(endpoint);
   if (text) hmac.update(text);
 
   const hash = hmac.digest("base64");