curl --request POST \
  --url https://api.member.dev/api/v1/hub/{hub_id}/checkout \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "attributes": {
      "price_id": "<string>",
      "cancel_url": "",
      "coupon_code": "<string>",
      "email": "<string>",
      "success_url": ""
    },
    "type": "<string>"
  }
}
'

{
  "data": {
    "attributes": {
      "order_id": "<string>",
      "status": "<string>",
      "session_url": "<string>"
    },
    "id": "<string>",
    "type": "checkout_sessions"
  }
}