curl --request POST \
  --url https://api.shoppex.io/dev/v1/customers/{id}/wallet/debit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": "4.50",
  "description": "Manual adjustment"
}
'

{
  "data": {
    "transaction_id": "txn_debit_1",
    "amount": 4.5,
    "currency": "EUR",
    "new_balance": 10.5,
    "available_balance": 8,
    "wallet_id": "wallet_1"
  }
}