curl --request POST \
  --url https://api.shoppex.io/dev/v1/customers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "[email protected]",
  "name": "Berlin Buyer",
  "phone": "+491234567",
  "country_code": "DE",
  "street_address": "Teststrasse 1",
  "city": "Berlin",
  "postal_code": "10115",
  "upsert": true
}
'

{
  "data": {
    "id": "cus_1",
    "shop_id": "shop_1",
    "email": "[email protected]",
    "name": "Berlin Buyer",
    "surname": null,
    "phone": "+491234567",
    "phone_country_code": null,
    "country_code": "DE",
    "street_address": "Teststrasse 1",
    "additional_address_info": null,
    "city": "Berlin",
    "postal_code": "10115",
    "state": null,
    "affiliate_revenue": 0,
    "affiliate_revenue_currency": "USD",
    "affiliate_revenue_percent": 0,
    "customer_balance": 12,
    "customer_balance_currency": "EUR",
    "created_at": 1710686400
  }
}