Hi @countrypark
As a default it’s possible, but only with standard WordPress rest API that includes wp-json in the URL
If you need to disable plugins with non-standard rest APIs that call URLs that don’t include wp-json, you need to add this line in wp-config.php before the comment /* That’s all, stop editing! Happy blogging. */:
define( 'EOS_DP_ALLOW_POST',true );
In this case, check all the actions that you can do on your website (submitting a form, adding a product to the cart…).
In both cases, you can use the settings Custom URLs => Frontend URLs
In the first case you can add something that looks like */wp-json/wp/v2/sample-parameter*.
For non-standard REST APIs add something that matches your URLs.
Let me know if it’s not clear.