bought iOS Autopublish, now what?

Hi friends
for Android I downloaded the apk (SAE)  and compiled with Android Studio, everything ok, the app is already on GooglePlay.

for iOS it takes more time to follow Apple’s whims than to create the app, so I bought iOS Autopublish and got a code. Where EXACTLY do I place it? In my backoffice, Settings/general? but where exactly? Can you help me?

Thanks in advance
Marco