curl --request POST \
  --url 'https://api.stateset.com/api/v1/checkout' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "data": {
    "billing_address": null,
    "cart_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "currency": "string",
    "customer_email": null,
    "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "payment_method": null,
    "shipping_address": null,
    "shipping_method": null,
    "step": "string",
    "subtotal": "string",
    "total": "string"
  },
  "errors": null,
  "message": null,
  "meta": null,
  "success": true
}