The dreaded update

In a city gripped by darkness a client had invested millions in an all-in-one loyalty platform. It thrived but its use of SOAP API turned it into a digital prison. Begging for a switch to REST API was futile. The vendor sensing the client's vulnerability unveiled a new version switching to REST API. However, they declared it a product change not a version update, old clients had to pay and the price was horrifying another several million USD. As Halloween neared this tale served as a chilling warning. Beware vendors who turn updates into financial nightmares, your wealth may vanish and you'll be left with a costly horror you never imagined. What are you afraid of when choosing loyalty technology?