Hello Michael Telgmann,
Thanks a lot for the help you have done, I have completed the payment by half of the way, but order mail is not received yet from the shop system (shopware6) for every order. I have added the sales channel in the email settings ( Setting->Email template ). But I am still wondering 
, why I have not got any order mail. just give me some hint to receive the order mail.
have a good day! 
Best Regards,
Charles