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Developer Shows How to Run WhatsApp Checkout and Client Proposals on Python and SQLite Without SaaS Fees

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A DEV Community article describes how small online sellers and freelancers can avoid recurring SaaS costs by building their own storefront tools. The author argues that subscriptions for e-commerce, invoicing, proposals, and messaging can add over $1,000 a year before a business earns any profit. The tutorial, written by the team at Antigravity Dev Studio, relies only on the Python standard library and SQLite, with no external frameworks or paid services. It covers three components: generating pre-filled WhatsApp order links through the official wa.me protocol, issuing collision-free invoice numbers using SQLite WAL mode, and securing client proposal acceptance links with HMAC signatures. The piece positions WhatsApp-based checkout as especially useful in markets across Latin America, the Middle East, Africa, and Southeast Asia, where the app is the dominant communication channel.

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