I don’t find the snippet)))
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You writing:
Hello Mikhail,
Thanks for contacting us.
I tested the event provided and got the error as described. Try inserting this snippet into the bottom of your theme’s functions.php file and see if the 400 Bad Request error goes away. If not, check our Testing for conflicts article and please reply privately with your System Information.
Thanks for choosing PRO and please keep me posted with the status of your issue. Have a great day!