Two ways feedback
We faced a lot of limitations to build this app as even though TLF had a public API, it was very limited. On one hand, we tackled error states with special care. Below is an example of no internet connection error. We helped the user get comfortable by setting expectations for what's happening and still gave them a hint of their latest cached balance. On the other hand, we started really simple and encouraged the user to tell us what they would like the app to offer so we could prioritise the next features.