Different template base url and uanble to update custom field

[a-rfl]

Context

We have an experience for the app that display a modal to the user to collect specific optin. The user can either :

• closed the modal -> slide the modal to close
• accept and close -> when clicking this option, the template send a request to update a custom field and then send a postMessage to the parent to trigger the closing function

Issue

A short while ago, we're not sure since when exactly, we noticed that the template base url changed and was different between IOS and Android. It changed from "https://buy-eu.piano.io" to "https://api-eu.piano.io".

This can be worked around by creating different templates for IOS and Android, but it also impacted the custom field update.
The request base url, we use, is the following : "https://experience-eu.piano.io/".
We also worked around that second issue, by forcing the "https://buy-eu.piano.io" on to the templates displayed on IOS.

Questions

• Is there an explanation on why the template base url have an impact on a request with a different base url inside a Piano template ?
• Why did the template base url changed ?