curl --request POST \
  --url https://api.loops.fi/api/v3/checkout/sessions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "line_items": [
    {
      "price": "<string>",
      "quantity": 1,
      "adjustable_quantity": {
        "enabled": false,
        "minimum": 2,
        "maximum": 2
      }
    }
  ],
  "mode": "payment",
  "success_url": "<string>",
  "cancel_url": "<string>",
  "payment_method_types": [
    "card"
  ],
  "customer": "<string>",
  "customer_email": "jsmith@example.com",
  "client_reference_id": "<string>",
  "metadata": {},
  "productId": "<string>",
  "quantity": 1,
  "externalCustomerId": "<string>"
}'

{
  "id": "<string>",
  "object": "checkout.session",
  "amount_subtotal": 123,
  "amount_total": 123,
  "automatic_tax": {
    "enabled": true,
    "status": "complete"
  },
  "billing_address_collection": "auto",
  "cancel_url": "<string>",
  "client_reference_id": "<string>",
  "currency": "<string>",
  "customer": "<string>",
  "customer_email": "jsmith@example.com",
  "expires_at": 123,
  "livemode": true,
  "locale": "<string>",
  "metadata": {},
  "mode": "payment",
  "payment_intent": "<string>",
  "payment_method_types": [
    "<string>"
  ],
  "payment_status": "paid",
  "setup_intent": "<string>",
  "shipping": {
    "address": {
      "city": "<string>",
      "country": "<string>",
      "line1": "<string>",
      "line2": "<string>",
      "postal_code": "<string>",
      "state": "<string>"
    },
    "name": "<string>",
    "phone": "<string>"
  },
  "submit_type": "auto",
  "success_url": "<string>",
  "total_details": {
    "amount_discount": 123,
    "amount_shipping": 123,
    "amount_tax": 123
  },
  "url": "<string>",
  "productName": "<string>",
  "externalCustomerId": "<string>"
}