What is an Idempotency Key?
A unique key that prevents duplicate payment session creation.
A unique key that prevents duplicate payment session creation. In Zateway, this concept powers non-custodial USDT/USDC payments on Polygon, Solana, Base, BSC, Arbitrum, Optimism.
Why Idempotency Key Matters for Merchants
Understanding Idempotency Key helps you design safer checkout. Zateway keeps funds non-custodial — payments route to your wallet while you still get webhooks, payment links, and API control.
How Zateway Handles Idempotency Key
Zateway supports production and sandbox flows so you can test Idempotency Key safely. Use payment sessions, HMAC webhooks, and multi-chain USDT/USDC to operationalize this concept without holding customer funds.
Best Practices
Prefer stablecoins over volatile assets, verify webhook signatures, wait for sufficient confirmations, and keep private keys offline. Pair Idempotency Key knowledge with Zateway's 1% flat fee model for predictable unit economics.