If so, you need SAP Universal ID. In a few months, SAP Universal ID will be the only option to login to SAP Community. Without it, you will lose your content and badges. If you have multiple accounts, use the Consolidation Tool to merge your content.
I like to process Invoice txn in SAP. Invoice data I am getting from a Legacy system via IDOC. The expected no. of txns per day wud be 400K. does SAP handle 400K IDOCs without big performance degradation.