Update a customer

curl -X PUT "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" \
  -d '{
  "name": "John Doe",
  "email": "john.doe@example.com",
  "phone": "+597-8123456",
  "default_currency": "SRD",
  "billing_details": null,
  "shipping_details": null,
  "metadata": {}
}'

{
  "success": true,
  "message": "Request was successful."
}