FAQ

How do idempotency keys stop a retried billing job from double-charging?

Set an idempotency_key field, derived from your own identifier such as the account and the cycle (acct_42-2026-06), on the invoice-creation request. A repeat call with the same body returns the original invoice instead of issuing a second one; a replay with a different body is rejected as an idempotency_key_mismatch. The same field protects payout creation, so a resubmitted payout run pays each recipient once.

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API-first crypto checkout for SaaSDrive crypto checkout from your backend over a typed API.Use cases questionsFrequently asked questions drawn from the halfin use cases pages. Each one links to a standalone answer.A request to an overseas publisher timed out — did I just pay them twice?No, if each line carries an idempotency key. Re-submitting the same key after a timeout, restart, or manual re-run returns the payout halfin already…Are course payments reversible like card chargebacks?No. Once invoice.paid fires under the chain's confirmation threshold, the payment has settled on-chain and there is no issuer-initiated reversal, so the…Are crypto casino deposits really chargeback-proof?A confirmed on-chain deposit is final — the sender can't reverse it the way a cardholder files a chargeback weeks after a bet settles, which closes the…Are crypto deposits really chargeback-proof?A confirmed on-chain deposit is final — the sender cannot reverse it the way a cardholder can file a chargeback weeks after a bet has settled. That closes…Are crypto payments through halfin reversible like card chargebacks?No. Once a payment is credited under the chain's confirmation threshold, it has settled on-chain and there is no issuer-initiated reversal. If you want to…Can a casino or sportsbook accept USDT deposits through halfin?Yes. You create a fiat-anchored invoice and the player pays in a supported asset such as USDT on Tron, Ethereum, or Solana. halfin credits the deposit…Can a CFD broker take deposits and pay withdrawals through the same integration?Yes — that is the point of using halfin for a CFD platform. Deposits are fiat-anchored invoices presented on hosted checkout; withdrawals are single…Can a creator withdraw in a different asset than they earned?Yes, through balance conversion. If the creator's balance is held in one asset but they want to withdraw USDC, conversion — automatic or manual — sits…Can a customer charge back a crypto payment made through halfin?No. A confirmed on-chain payment settles on the blockchain, not inside a card network, so there is no issuer and no dispute mechanism that can reverse it…Can a customer in any country pay my store this way?Anyone with a wallet on a network you enable can pay — there is no issuing bank in the path to apply a geographic decline. They pay from their wallet…