fix: B2B-3725 add required b2b headers

Author: bc-victor

core/b2b/client.ts

@@ -14,6 +14,7 @@ const ENV = z
     env: z.object({
       B2B_API_TOKEN: z.string(),
       BIGCOMMERCE_CHANNEL_ID: z.string(),
+      BIGCOMMERCE_STORE_HASH: z.string(),
     }),
   })
   .transform(({ env }) => env);
@@ -29,7 +30,7 @@ const B2BTokenResponseSchema = z.object({
 });
 
 export async function loginWithB2B({ customerId, customerAccessToken }: LoginWithB2BParams) {
-  const { B2B_API_TOKEN, BIGCOMMERCE_CHANNEL_ID } = ENV.parse(process);
+  const { B2B_API_TOKEN, BIGCOMMERCE_CHANNEL_ID, BIGCOMMERCE_STORE_HASH } = ENV.parse(process);
 
   const apiHost = getAPIHostname();
 
@@ -39,6 +40,8 @@ export async function loginWithB2B({ customerId, customerAccessToken }: LoginWit
       Accept: 'application/json',
       'Content-Type': 'application/json',
       authToken: B2B_API_TOKEN,
+      'X-Store-Hash': BIGCOMMERCE_STORE_HASH,
+      'X-Auth-Token': B2B_API_TOKEN,
     },
     body: JSON.stringify({
       channelId: BIGCOMMERCE_CHANNEL_ID,