I have conducted a test and it will be better, but it is still not very procedural. It will only be reflected after sending a series of emails such as bills.
Someone else solved this problem and used the 'Mail Queue' plugin, but I don't know where it is available for sale
The function of an email queue is to complete shopping and other operations, and then send emails
But your module will not display the original price of the product during the settlement process. I come from China and I have tested your plugin before because I cannot understand all the functions in English
When using WHMCS to purchase products, they always stay for a long time on the checkout completion page, as if processing the sending email, and the billing email page will only reflect after sending it. Is there any way to improve and make WHMCS checkout faster