curl --request POST \
  --url https://{baasHost}/api/v1/wms/wallets/{walletId}/reserve \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 15000,
  "currency": "TZS",
  "reference": "ORDER-2026-001",
  "description": "Hold for merchant delivery"
}
'

{
  "transactionId": "tx-uuid-..."
}