A guest can't see an upsell. Check it's on the listing's Upsell Assigned tab, then its Show and Hide rules (Hide wins), and its Service Hours. → Upsells
A guest can't pay. Check the listing is assigned to a connected Stripe account under Settings → Integrations → Payment Gateways. → Settings
Stripe won't connect. Both keys must be from the same Stripe account and the same mode: both live (pk_live_, sk_live_) or both test. → Settings
The guest paid but I haven't got the money. Payments land in your Stripe balance; payouts to your bank follow your Stripe payout schedule. Make sure your Stripe verification is complete. → Payment Requests
A promo code doesn't work. Check it's Active, today is inside its booking window, the check-in is inside its stay window, the guest is on the right channel, and the quota isn't used up. → Marketing
Entries aren't reaching my accounting software. Check the tool is Connected under Finance → Integrations, then click Push now. → Finance
My DATEV export is empty. A Buchungsstapel only contains EUR bookings; check the month and the exclusion summary. → Finance