Your GraphQL schema can be fetched and updated using the /admin endpoint of your cluster. As an example, if your GraphQL endpoint is https://frozen-mango.us-west-2.aws.cloud.dgraph.io/graphql, then the admin endpoint for schema is at https://frozen-mango.us-west-2.aws.cloud.dgraph.io/admin. This endpoint works in a similar way to the /admin endpoint of Dgraph, with the additional constraint of requiring authentication.

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Fetching the current schema

It is possible to fetch your current schema using the getGQLSchema query on /admin. Below is a sample GraphQL query which fetches this schema. 
{
  getGQLSchema {
    schema
  }
}

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Setting a new schema

You can save a new schema using the updateGQLSchema mutation on /admin. Below is an example GraphQL body, with a variable called sch which must be passed in as a variable 
mutation ($sch: String!) {
  updateGQLSchema(input: { set: { schema: $sch } }) {
    gqlSchema {
      schema
      generatedSchema
    }
  }
}