Ultimately, the merchant bears the risk of non-payment, but the platform does its best, using industry-standard practices, to pre-check the customer and their payment methods for fraud and ensure a successful payment.
If a merchant successfully authorizes a charge, the amount is reserved for that merchant for a limited period. Trying to capture that amount (or less) during this period will succeed.
I'm a little confused. Is Small Transfers not the merchant for the CC transaction? (Your website suggests Small Transfers is the merchant of record and then transfers funds to the seller.) If not, what's your role in the settlement process?
Yes, Small Transfers is the merchant of record for the card charge. We transfer only funds actually received to the merchant's Stripe account; we don't advance funds. As per the Terms (§1 "Transfer" and §5.6 "Non-Payment"), chargebacks/reversals are net-deducted from future transfers, so the seller bears non-payment risk.