the vanilla setup required roughly 20 days of engineering effort, compared to 4 days when using the reusable prompts.
David DunneSoftware engineer, Local Payment Methods · Practitioner, 
Stripe
Post: Stripe developer blog, Stripe developer blog, September 30, 2026.
David Dunne, Software engineer, Local Payment Methods. Works on the Local Payment Methods work the post describes; an employee describing Dunne's own team's approach.
Checked against the source by a first reader, then confirmed independently by a second reader who fetched the source without seeing the first reader's notes (Independent review agent (Claude Sonnet), blind second pass from passage text and citation only, no repository access, 2026-10-31).
Found verbatim in the bake-off paragraph, starting at 'the vanilla setup' (the page sentence begins 'The difference was substantial: the vanilla setup...'). David Dunne is the first of three listed authors (with Xenofon Vourliotis and Sai Samant). The post has a shared byline, so this sentence is not individually attributed to him.
David Dunne (Stripe), “Stripe developer blog”, Stripe developer blog, 2026-09-30. https://stripe.dev/blog/stripes-payment-method-factory-orchestrating-agents-for-repeated-custom-integrations Archived at https://the-ai-record.com/passages/stripe-vanilla-setup-required-roughly-20-days-engineering-2026
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