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Work through these nine steps in order. Steps 1 to 7 happen before you switch, step 8 is the switch, and step 9 runs both systems down. Assume nothing else moved. Your catalog and inventory are in TWICE 2.0, nothing has been switched over, and 1.0 is still taking your orders. Follow the launch path instead if you are setting up a new account rather than migrating one. A migration has a live system on the other side of it.

Two rules that hold throughout

Break either of these and you get double-sold stock or money you cannot reconcile.
Take new orders in one system only. Run collections and returns in both at the same time; that is fine. Never take new orders in both, or the same stock item gets sold twice.
Keep 1.0 running until everything made before the switch is closed. Orders, deposits, saved cards and order history stay there. If you take bookings dated months ahead, that is later than you think.

The nine steps

Check what was migrated

Done when: your counts and prices reconcile against 1.0, and anything that did not has an owner.

Configure settings

Done when: every settings view has been opened and either configured or confirmed as not needed.

Connect payments

Done when: a live-mode payment has been taken and refunded.

Move your subscription

Done when: your trial has started and your 1.0 subscription shows as canceled.

Test your processes

Done when: your own people have run every case, unaided, and seen the customer-facing output.

Set up and train your team

Done when: every user has the right role and each location has a named superuser for the switch.

Clear the external dependencies

Done when: your store address is live, integrations are repointed, and 1.0 exports are stored outside TWICE.

Switch new orders to 2.0

Done when: every 1.0 intake channel is closed and you have placed a real transaction in 2.0.

Run both systems until 1.0 is finished

Done when: the last pre-switch order is closed and your records are stored outside TWICE.

If you do not take bookings

Work through every step anyway. Expect 1.0 to empty in days rather than seasons. Several steps exist because a booking is made on one date and fulfilled on another: running both systems down, blocking stock out on a 1.0 booking, releasing deposits from the 1.0 order.

Confirm anything outside the default scope

Confirm anything beyond the default scope with your TWICE contact rather than assuming it moved. This path covers what migrates by default.

Launch path

The same sequence for a new account rather than a migrated one.

TWICE Commerce overview

What the platform does and how its pieces fit together.