[development-axapta] Posting Invoices to Axapta - Which SDK or Module Do I Use

[syzzygy2001]

I am very new to Axapta.  In GP I had the ability to use eConnect to 
post invoice data and create a voucher.  What facility does Axapta 
provide for this?  Is there a formal module or do I need to create a 
presentment service using the SDK?

Thanks!