curl --request POST \
  --url https://rdp.sh/api/v1/servers/{server}/renew \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "duration": 1
}'

{
  "status": true,
  "message": "<string>",
  "invoice_id": 123,
  "amount_charged": 123,
  "new_expiry_date": "<string>",
  "server": {
    "id": 123,
    "ip_address": "<string>",
    "expiry_date": "<string>",
    "suspended": true
  }
}