As volume grows, the questions change from whether software can record a sale to whether it can handle thousands without manual work. Look for automatic payout matching, multi-currency on the plan you can afford, clean handling of fees and refunds, and an accountant login so your year end does not depend on spreadsheets exported from five platforms. Test it with a real month of payouts before you commit, because demo data never includes the refunds and partial payouts that real shops see.
Postage, couriers and packaging are among an online shop’s largest costs and are easy to under-record when paid through platform accounts. Make sure each platform’s shipping charges are captured as expenses with their VAT treatment, and that shipping charged to customers is recorded as part of the sale.