When I'm using the following mutation in GraphiQL App it works perfectly but when I run it using Postman or CURL it just doesn't work. This issue is happening for Function related mutations only. The Mutation: mutation { discountAutomaticAppCreate( automaticAppDiscount: { title: "Volume Discount Created from APP 011", functionId: "9d8aas8-78asd-8d7sa-86f0-dg789asdfa9sd", startsAt: "2023-09-19T00:00:00"} ) { # Payload userErrors { code field message } automaticAppDiscount { discountId title status createdAt endsAt } } } The error that I get when using CURL or Postman: "data": { "discountAutomaticAppCreate": { "userErrors": [ { "code": "INVALID", "field": [ "automaticAppDiscount", "functionId" ], "message": "Function not found." } ], "automaticAppDiscount": null } } The Functions that I'm using to make the CURL request(Though it's not that important as this is just working fine for many other queries): public function makeGraphqlApiRequest($data) { $storeName = 'store-name'; $apiVersion = '2023-07'; $accessToken = 'access-token'; $graphqlEndpoint = "https://$storeName.myshopify.com/admin/api/$apiVersion/graphql.json"; $headers = [ "Content-Type: application/json", "X-Shopify-Access-Token: $accessToken" ]; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $graphqlEndpoint); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, $data); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); $response = curl_exec($ch); if (curl_errno($ch)) { return 'Curl error: ' . curl_error($ch); } curl_close($ch); return $response; } // End makeGraphqlApiRequest Method Later I rechecked the "shop-name" and "api-version" both in GraphiQL and CURL, Postman. They all had same shop-name and api-version. What can I do to solve the problem? Thanks!