When a member requests an A2A transfer the request is stored in the A2ATRANS file in FILExx (where xx is your credit union ID). CU*BASE has a program which checks that file periodically through out the day. If there is a new item in the file, CU*BASE sends that information to Magic-Wrighter.
You will need to take into consideration that there is a daily cut-off time (arranged by you with Magic-Wrighter) and these transactions can take up to 2 business days. So for example, if a request is entered on a Monday before the daily cut-off it will be processed by Wednesday; requests entered after the daily cut-off it will not be processed until Thursday. Also, if a request is done on a Friday you will need to take into consideration the weekend. M-W is also subject to the usual ACH schedule of Federal holidays.