curl --request POST \
  --url https://api.sandbox.zafapay.com/v1/payments/{id}/capture \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "amount": 1000
}'

{
  "success": true,
  "transaction_id": "tx_abc123",
  "status": "completed",
  "amount_captured": 1000
}