Update the VAA hash to use payload hash (#422)

* Update the VAA hash to use payload hash

* Bugfix

Author: ali-behjati

third_party/pyth/price-service/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@pythnetwork/pyth-price-service",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "Pyth Price Service",
   "main": "index.js",
   "scripts": {

third_party/pyth/price-service/package.json

@@ -160,7 +160,11 @@ export class Listener implements PriceStore {
   async processVaa(vaa: Buffer) {
     const { parse_vaa } = await importCoreWasm();
 
-    const vaaHash: VaaHash = createHash("md5").update(vaa).digest("base64");
+    const parsedVaa = parse_vaa(vaa);
+
+    const vaaHash: VaaHash = createHash("md5")
+      .update(Buffer.from(parsedVaa.payload))
+      .digest("base64");
 
     if (this.observedVaas.has(vaaHash)) {
       return;
@@ -169,8 +173,6 @@ export class Listener implements PriceStore {
     this.observedVaas.set(vaaHash, true);
     this.promClient?.incReceivedVaa();
 
-    const parsedVaa = parse_vaa(vaa);
-
     let batchAttestation;
 
     try {