I don't currently have the paid version, but since it says I will only be refunded IF something is wrong with the plugin.
I want to know if there is a snippet for wordpress' custom api endpoint in the library.
Yes, if you have problems with the plugin, we return the money within 14 days from the date of purchase.
There are no snippets for wordpress' custom api endpoint in the library. But your link are all painted in detail and you can write the snippet myself