in your app: qr code validity in a wider context
I mentioned this earlier in the topic, but you did not respond to this.
Will your qr codes only be used in your app? It is most likely they will have no validity in a wider context, and will most probably not qualify or be seen as valid covid passports country wide or internationally.
In Europe and many other countries around the world, a standard qr code format, with base45 encoding, is used to generate valid covid passport qr codes, which can only be generated by government agencies. The data can be read using an extension:
You may want to read through this topic in detail / follow any links....