Web services new account with ????

Hi all, We are configuring a source that in the operation of creating an account you give some attributes in the body and the app create the account with an id but this isnt return on the API only give a success satus.

Until the aggregation we can know the ID, the problem is that the entitlements that we request are not provided because they require that account ID.
We try to solve it with an after operation rule we need to bring all the users to look for the one we just created. Which takes a long time for the rule, giving a time out at 60 seconds. do tou have some other proposal that can be used or the way to increase that timeout of 60 seconds?