List customers

curl -X GET "https://api.live.paisr.tech/v2/customers" \
  -H "Authorization: Bearer <access_token>" \
  -H "User-Agent: MyApp/1.0" \
  -H "Content-Type: application/json"

{
  "success": true,
  "data": {
    "customers": [
      {
        "id": "cus_123456",
        "name": "Jane Smith",
        "email": "jane@example.com",
        "phone": "+597-8123456",
        "default_currency": "SRD",
        "billing_details": null,
        "shipping_details": null,
        "metadata": {},
        "session": {
          "url": "https://portal.paisr.tech/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9",
          "expires_at": "2024-01-15T10:30:00Z"
        },
        "created_at": "2024-01-15T10:30:00Z"
      }
    ]
  }
}