Retrieve a customer

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

{
  "success": true,
  "data": {
    "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"
  }
}