Update affiliate settings

curl --request PATCH \
  --url https://api.shoppex.io/dev/v1/affiliates/settings \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "affiliate_revenue_active": true,
  "affiliate_revenue_percent": 25,
  "affiliate_customer_discount_active": true,
  "affiliate_customer_discount_percent": 10,
  "affiliate_custom_link_active": true,
  "affiliate_custom_link_must_approve": false
}
'

{
  "data": {
    "message": "Affiliate settings saved."
  }
}