I got an e-mail that I need to send the missing crypto, but I sent the exact amount

Typically, this occurs when the cryptocurrency transfer is not completed within the 30-minute window we provide for a fixed rate. After 30 minutes, our system recalculates the exchange rate, which may necessitate sending additional cryptocurrency to finalize your SwapinPay transaction. If this is not the issue, please reach out to our support team at customer@swapin.com.