The customer app: collection by code, notification when the parcel arrives, and a view of what is waiting.
Why this
The app carries your brandWhite label on iOS and Android, plus a Software Development Kit for building the pickup into the app the customer already has. The customer deals with the store, not with the software vendor.
The message arrives when the parcel doesThe notification flow is set up the way the operator wants it, and the customer sees the status of their own parcel. The pickup reminds people by itself — phoning them is not the store's job.