Assign merchant role to member

this api assign merchant role to member

GRAPHQL

Fields	Type	Description	Example	O/M	Data Management
URL	string		`{base_url}/graphql/loop-merchant-payments-service`	M
GRAPHQL	string		MUTATION	M
content-type	string	JSON	application/json	M
x-access-token	string	Session token with validity	token	M	admin token

{
  mutation {
    assign_merchant_role(
      member_id: "ABCD1234"
    ){
      success
    }
  }
}

{
  "success": true
}