If your lottery app lets users buy tickets using USDT, you’ll need a crypto payment gateway that can handle USDT transactions reliably and securely. Basically, when a user decides to purchase a ticket, the gateway should trigger a transfer of USDT from their wallet to your admin wallet all handled on-chain.To do this, you can integrate a payment API that supports USDT (especially on TRON or Ethereum,depending on your preference). That way, you can automate the whole process from payment initiation to confirmation.I’ve been using HeraldEX for similar setups. It supports USDT payments, has solid API documentation, and handles wallet-to-wallet transfers cleanly. Plus, it includes security features like webhook confirmations, so you know exactly when the payment is received.