I figured it out! I added the REST route of the endpoints to LiteSpeed Plugin > Cache > Excludes > Do Not Cache URIs
/wp-json/myroute/v1/
Now it works!
After additional research I discovered that customization of emails is done via the WooCommerce settings under the Emails tab.
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This reply was modified 4 years, 3 months ago by jfkeidel.
I switched to another plugin. Thank you.
Thank you for responding to this issue.
Here is the link to my registration form:
https://orderace.com/register/
Thank you, in advance, for your help.