Thank you for your information, I will do some test to see how it works:)
As you mentioned, B1iSN9.0 and the Integration Framework are fully compatible: Only one B1 Event Sender must be installed.
One question, Currently we are still using B1iSN8.8 and I am trying to do the migration towards B1iSN 9.0 or B1if. the Migration takes a lot of time because of a lot of scenarios to be migrated manually in my company. So, before the migration, We hope B1iSN8.8 can still running and I want to install a new B1iSN9.0/B1if to integrate with B1. Because I have a project on my hand and I can't wait until the migration. The project is that to setup a B1 integration with external system via EDI by using SMTP+XML, but seems B1iSN8.8 doesn't support SMTP/HTTPs,
So that's all the problems above I am facing now.