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As information about the delivery service's customers change, the difficulty of propagating the change becomes exponentially more difficult as more systems are brought online:
<insert spider-web looking diagram>
The onus of transferring data between systems becomes a data integration nightmare where some systems have to spend a great deal of resources converting data so that it can be consumed by or received from other systems. It is a common data integration practice to in batch so that changes are not made in a timely fashion.
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