ChainPay Aims to Simplify Stablecoin Checkout With Built-In Order State Management

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A developer building a tool called ChainPay has outlined the core engineering challenges that arise when merchants add stablecoin payments like USDT to their stores. Basic implementations that display a wallet address and wait for a transaction tend to fail in production due to edge cases such as partial payments, wrong networks, expired orders, and duplicate webhooks. The proposed solution centers on a state machine that tracks each payment intent through defined statuses — pending, paid, underpaid, overpaid, or expired — rather than treating blockchain transaction detection as the entire payment logic. Idempotency is highlighted as a critical requirement, ensuring that retried webhooks never trigger duplicate order completions. ChainPay is currently in pre-launch, targeting merchants, WooCommerce users, SaaS products, and AI agents that need stablecoin checkout without building custom payment infrastructure.

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