curl --request PUT \
  --url https://api.closebot.com/agency/billing/options \
  --header 'Content-Type: application/json' \
  --header 'X-CB-KEY: <api-key>' \
  --data '
{
  "overBillingEnabled": true,
  "autoRefillEnabled": true,
  "topUpAmount": 123,
  "refillThreshold": 123
}
'

{
  "overBillingEnabled": true,
  "usageBillingEnabled": true,
  "autoRefillEnabled": true,
  "topUpAmount": 123,
  "refillThreshold": 123,
  "currency": "<string>"
}