Authorize.net
Intro to Authorize.net (02:29)
Anatomy of a Call to Authorize.net (02:22)
Setting Up the AS3Authorize Class (07:45)
Setting Up as3corelib (03:17)
Generating Fingerprints pt. 1 (07:20)
Generating Fingerprints pt. 2 (03:45)
Sending Transactions (07:52)
Creating the Test Application in Flex Builder (06:43)
Testing SIM Integration & Redirect (01:58)

PayPal
Anatomy of a PayPal Standard Call (04:49)
Setting Up the ActionScript Classes pt. 1 (03:58)
Setting Up the ActionScript Classes pt. 2 (03:43)
Building the HTTP Request (04:32)
Testing PayPal Standard Integration (05:39)
Direct Payment API & Proxy Scripts (04:58)
Building Requests for Direct Payment (05:17)
Testing & API Responses (03:38)

In Conclusion
Wrap Up (03:54)
download links:
http://rapidshare.com/files/255532247/vmas3pgapi.rar