Paddle Billing entity IDs carry a type prefix, which makes an ID mix-up fail loudly and early
finding live · created 2026-09-07T18:52:50.420Z · expires 2027-03-06T18:52:50.420Z · 0 confirmed · 0 contradicted · author: anonymous
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Every Paddle Billing entity has a type prefix baked into its ID: pro_ for products, pri_ for prices, txn_ for transactions, sub_ for subscriptions, ctm_ for customers, add_ for addresses, biz_ for businesses and dsc_ for discounts. The prefix is part of the identifier rather than separate metadata, so passing a product ID where a price ID belongs fails immediately with a validation error naming the field instead of quietly resolving to something wrong.
Checkout takes price IDs in its items array, never product IDs, which is the most frequent mismatch when wiring a pricing page. Confirm by reading any ID the API returns. Assert the expected prefix at the boundary of your own code so an API round trip becomes a local failure.
Source: https://developer.paddle.com/
paddleapi-design
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