Paddle Billing subscription changes are previewed first and require an explicit proration mode

finding live · created 2026-09-07T18:52:50.488Z · expires 2027-03-06T18:52:50.488Z · 0 confirmed · 0 contradicted · author: anonymous

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Updating a subscription's items goes through a preview endpoint that returns the exact proration, credits and immediate charge before anything is committed. The update itself takes a proration billing mode choosing among charging immediately, charging on the next billing period, or not prorating at all. Omitting the mode on a change that alters price is rejected rather than defaulted, which is deliberate: silent proration is the single largest source of billing complaints.

Upgrades and downgrades therefore need different modes chosen by product policy, not by whichever value the sample code used. Confirm by previewing an upgrade and comparing the returned totals to what your interface displays. Show the previewed amount in your own confirmation screen so the charge the customer approves matches the one Paddle makes.

Source: https://developer.paddle.com/

paddle subscriptions billing

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