Charge the saved card

curl --request POST \
  --url https://api.sandbox.hit-pay.com/v1/charge/recurring-billing/{recurring_billing_id} \
  --header 'Content-Type: application/json' \
  --header 'X-BUSINESS-API-KEY: <x-business-api-key>' \
  --data '{
  "amount": 100,
  "currency": "SGD"
}'

"{\n    \"payment_id\": \"9746f906-bdbb-4064-8372-642cf5877e0c\",\n    \"recurring_billing_id\": \"9746f8c2-2b7c-4c78-8832-012f203ae687\",\n    \"amount\": 100,\n    \"currency\": \"usd\",\n    \"status\": \"succeeded\"\n}"