How to change the GraphQL endpoint

[apetrovici]

I am using this package to build a Shopify Payments App. Currently, all GraphQL queries are executed by sending POST HTTP requests to the endpoint:
https://{shop_id}.myshopify.com/admin/api/2021-10/graphql.json

but the Payments Apps API is available at:
POST https://{shop_domain}/payments_apps/api/2021-10/graphql.json

Checking the GraphQL client, I can see that there is no option to change the endpoint path. What would be the best approach to accomplish this?

Thanks.