The switch your customers never feel.
Every subscription is rebuilt against the card your customer already saved with Shopify: same lines, same price to the penny, next charge on the original date. No new payment form. No “update your payment method” email. No gap for churn to crawl through.
0 writes before you attest0 cards re-entered, by designpricing recreated to the pennyfirst charge on the original dateuploads auto-purge in 14 days
Those aren’t promises: they’re properties of the design, and the design is open source. Read the code, or have your AI Engineer walk you through it.
Nothing heavy moves.
Switching gets sold by the size of the truck: how many subscribers hauled, how many at once. Here’s the secret about yours: there is no truck. The heavy things (the cards, the vault, the checkout) live with Shopify and never move. A subscription platform is only the clock that tells Shopify when to bill, and migration is the handing-over of that clock: quiet, checkable, reversible. Five fears, killed in order.
Your subscribers never see a payment form.
“Half my list gets an ‘update your payment method’ email, and a third of them never click it.”
Never sent, because it’s never needed: each new contract is pointed, by reference, at the card your customer already vaulted with Shopify Payments, and a read-only check confirms that card is live and hers before anything is created. Nothing card-shaped ever passes through the tool.
It rehearses the whole switch before it writes a word.
“Migrations guess. A guess, in billing data, is an incident.”
Drop the export in. It fingerprints the columns and knows Skio’s file, Stay’s, Recharge’s four on sight (anyone else enters through a documented template), then rehearses every row against your live store, read-only: this customer exists, this variant exists, this card is active. Whatever it can’t verify it blocks, with a named reason and a remedy; it never guesses. Stay’s exports carry no card reference at all, so it resolves each customer’s one active card and stops the row cold if it finds none, or two. Nothing is written until you’ve read exactly what will happen and attested to it.
The first charge lands to the penny, on the day.
“Somebody gets billed twice, or at the wrong price, and I hear about it from a customer.”
Exact per-line pricing comes across as Shopify pricing policies, including the grandfathered 15% someone negotiated in 2022, so the discounted price is the billed price, forever, and the next charge lands on the very date the old platform would have taken it. Paused subscribers keep their resume dates; nothing bills early, nothing backdates; and the run won’t start until you confirm the old platform’s billing is off: that’s how double billing dies.
A crash can’t cost you a contract.
“It dies halfway, and I’m stranded between two platforms.”
Every contract is claimed in an append-only ledger the moment it’s created, so a double-click can’t create it twice and a dropped connection can’t lose it: close the laptop and the page greets you back with a Resume banner, skipping everything already done. The run narrates itself in plain words (“Migrating… X of Y done. Keep this tab open.”) and ends in a receipt: every contract, its status, its original subscription ID, downloadable.
Even the regret is handled.
“And if I want to go back?”
Rollback undoes exactly what this migration created and nothing else: it expires contracts rather than cancels them, so your churn numbers stay honest, and it refuses, contract by contract, the moment a real order or charge exists. Your old platform keeps running until you turn its billing off; you uninstall it last, after you’ve verified; and the file you uploaded purges itself after 14 days. We put handles on both sides of the door.
Your customers won’t notice. Your P&L will.
That’s the whole trade: invisible from the outside, checkable from the inside: a dry run you can read, an attestation only you can give, a ledger that can’t lose count, a receipt you can keep. And on the first of the month, the percentage simply isn’t there.
On the call: a live demo, and the cutover plan for your book.