Payments not automatically getting updated in whmcs. When we check whmcs logs it says "IPN handshake invalid Error ".

IPN handshake invalid will indicate that the Character Set in your PayPal account does not match the one set in WHMCS.

Please follow these steps to set your PayPay charset to UTF -8 : https://docs.whmcs.com/PayPal_Basic#Charset_Configuration

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