GraphQL query connect to Dutchie API using PHP

I have a store in Dutchie.com. I want to access it’s products using API key.
This has to do via Dutchie API using GraphQL integrated with PHP.

This is the API Key:

public-eyJhbGciOiJIUzI1NiJ9.eyJhdWQiOiJBUEktQ0xJRU5UIiwiZXhwIjozMzE4NjM5Mjc0NSwiaWF0IjoxNjI5NDgzOTQ1LCJpc3MiOiJodHRwczovL2R1dGNoY29tIiwianRpIjoiNGMtOTMyOC00MjhkLWEyYTMtOWQzMTc2ZTUwODY0IiwiZW50ZXJwcmlzZV9pZChLWExYTctNDM3OC05NWY4LTNlYzVzBiNSIsInV1aWQiOiI0M2ZlMjdkNy1iZWU2LTQxOTgtYWNhMi03N2Y5Y2I3MjI5MGIifQ.hCQWpcQ5uhKnZOSVQDA5SCMkx5kopC7H3upeU-1jMpg

This is the GraphQL Ping mutation.

mutation Ping {
  ping {
    id,
    time
  }
}

Dutchie End Point: https://plus.dutchie.com/plus/2021-07/graphql

Basically I want to run GraphQL query in my PHP page. I’ll add into my WordPress page later.

I have tried php-graphql-client php library.
Can someone help me to do this using above library or another one really appreciate. I wasted too much time for this as I have only few knowledge of GraphQL.