A web service includes a web service manager for servicing an originating
message received from an originating client application, wherein the
originating message has verification information a data package having an
encrypted portion. The web service manager verifies that the originating
message originated from an authorized originating client application,
using the verification information. An identifier generator creates a
data package identifier associated with the data package and a location
within a data package store used for storing the data package. A message
generator generates a notification message which is sent to a receiving
computing system. Upon receipt of at least a portion of the notification
message from the receiving computing system, the web service manager
retrieves the data package from the data package store and initiates
transfer the data package to the receiving computing system.