The whole product, documented — plus the parts that only matter here: GST, what makes a tax invoice, what changes the moment you sell to someone overseas, and getting it all into Xero.
These four exist only on this site. They are the things a checkout built somewhere else gets not-quite-right.
What 15% applies to, how an inclusive price splits, and when you are required to register.
The three value thresholds, the 28-day rule, and why the law stopped saying “tax invoice” in 2023.
Zero-rated exports, the evidence Inland Revenue actually asks for, and why this ships switched off.
What crosses over, why a payout is not a sale, and the things it does not do for you.
The difference between a product and an offer, and why that separation is what lets one thing be sold several ways.
What the buyer sees, what you can change about it, and what you deliberately cannot break.
Several products on one page, quantity rules, and how a basket prices itself.
The checkbox add-on, and the one-click post-purchase chain of upsell, downsell and second upsell.
Percentage and fixed discounts, the floor that stops a coupon reaching zero, and how tax is worked out after the discount.
Recurring billing on your own processor, trials, renewals, failed payments and what happens when someone cancels.
Which processor holds your money, when it lands, and why one deposit is almost never one sale.
Connecting an Airwallex account, step by step, including where the credentials actually live.
Wiring the callback so a paid order actually becomes a paid order in GoCushy.
This is the part that is genuinely different from other checkouts: an AI agent you already use can operate the whole thing.
Connect Claude or ChatGPT over MCP and let it build products, offers, checkouts and funnels on your own account.
Tested phrasings for the things people actually ask an agent to do, and why vague requests produce vague funnels.
Packaged instructions that teach an agent a whole workflow — invoicing setup, tax configuration, launch checklists.
Email platforms, accounting, notifications, and what each one actually moves.
Getting a message in Slack, Discord or Telegram the moment something sells.
Giving someone access without giving them everything.
The REST API, webhooks, the MCP server, and the contracts a buyer’s agent reads.
Step four takes two minutes and catches more than anything else on this list.
The blog covers the same ground at more length, including what a payment processor actually stores about where your buyer was, and the difference between a zero-rated and an exempt sale.
General information about how GoCushy behaves, correct as at 19 August 2026. It is not tax advice about your circumstances — your accountant knows those and we do not.
Tell us what's happening and we'll email you back. A real person reads every message.
We'll reply to . If it's urgent you can also email support@gocushy.com.