I have two use cases, both of which have been implemented in v6 but I need a little more understanding as to how this would/would not work in ACS.
1. A segment is created in ACS and pushed via the REST API to an external data base (this exported segment is ultimately used by another tool to push messages to the recipients)
2. An external application calls ACS REST API every 15 minutes in order to update the marketing database, both standard tables such as the recipient are updated as well as custom tables. This 15 minute update happens 24x7. Any limitations on the API use case and/or the frequency of calling.
I completely agree with the inputs shared by my collague Florent. In addition to that, I see two possible concerns here.
For Use Case
2. There is a defined limit on number of API calls you can fire per your contract. Do have a check on that as an API call every 15 minutes might cause you go overquota.