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Integrating with external systems that you don't control

June 12, 2020 -

As part of the food ordering app I am building, I needed to design a reliable way to link the app to external systems. These external systems are beyond my direct control and include different checkout registers, kitchen management systems and ticket printers. Read along for more on designing for the unknown and unreliable.

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Printed ticket - through an external connection - including detailed order data like product modifiers (customer's choices per product)
Printed ticket - through an external connection - including detailed order data like product modifiers (customer's choices per product)
Integrating external systems into your app is like fitting third-party parts to an engine: you must carefully consider their fit and reliability (image of a combustion engine, public domain)
Integrating external systems into your app is like fitting third-party parts to an engine: you must carefully consider their fit and reliability (image of a combustion engine, public domain)
Lemmid Store - an app to order takeaway food
Lemmid Store - an app to order takeaway food
Separating the main backend server from the external systems by introducing a purpose built 'connector server'
Separating the main backend server from the external systems by introducing a purpose built 'connector server'

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