Supply chain disruption continues to affect retailers, consumer packaged goods companies (CPGs), and customers. Constraints on the ability to produce goods have limited the availability of in-demand products, leading to inflation. Not only are manufacturers not making enough products in line with demand in industries such as automotive and electronics, at the same time, those products have become much more expensive.
QR codes have entirely transformed how businesses connect with their customer base. These intriguing square-shaped codes house embedded information that can be effortlessly scanned using smartphones, directing users to specific websites, enticing landing pages, or irresistible promotional offers. The versatility of QR codes knows no bounds as they seamlessly integrate into many marketing campaigns, ranging from product packaging and print advertisements to innovative business cards and beyond.
In this series, we've seen how to create GraphQL APIs in Elixir using Absinthe. So far, we have only discussed a one-way communication channel where the client makes the queries or mutations, and the server responds. GraphQL also supports a long-running subscription between the client and the server where the server can notify the client of events. This can be very useful in multi-user scenarios where many users might interact with the same resource at the same time.
