What SendingThx charges you as a merchant. What you charge your own customers, if anything, is entirely up to you.
One flat rate covers the entire loop for that gift — there's no per-message or per-reply add-on:
Usage-based, billed monthly — you're only ever charged for gifts actually sent, never a flat subscription regardless of volume. If you're on the Shopify App Store, charges run through your normal Shopify billing. If you're integrated directly via the API, charges appear as a Stripe invoice on your regular billing cycle.
SendingThx doesn't see, set, or take a cut of anything you charge your own shoppers. Retailers we work with handle this a few different ways, and none of them require any special setup on our end:
Whichever you choose, it happens entirely on your storefront and your invoice to your customer. SendingThx's $0.50 charge to you stays the same either way.
No hidden fees. No setup fee, no monthly minimum, and no long-term contract. Cancel anytime by uninstalling the app or simply stopping API calls.