Hi @henrique ,
In terms of availability, the Migration API is currently in Beta and requires an API key to access.
However, admin users of all Prismic repositories have access to a demo key via the menu item "Migration Release", it is available when you click "Try Migration API". along with instructions on how to make your first request.
For lower request volumes and for setting up and testing the Migration API, this demo key should already be sufficient.
We are updating the documentation and I will also add this to the FAQ on transitioning to Migration API so that it is clear a demo key is already available without the waitlist.
In cases where you anticipate large bulk updates or creation of hundreds of new documents and require a more stable rate limit, it's best to request a key via the waitlist, as you have done.
Generally, it takes around a week to get a key via the waitlist - I will be sending you and other users who signed up last week a key during the next days.
Aside from this, I appreciate that it can be challenging to implement this change by April 30.
Can you share some more info about your specific concerns or what you see as the biggest challenge currently, as we are in the process of putting together some tools to assist in the transition and can incorporate your feedback.
Best,
Alaina