How do you find a developer of an app that hasn't been updated? I purchased a scripture app for $15 several years ago.  It is the best I have ever used.
When my iPhone screen went black I had to replace my phone. The app did not reload.  I assume it is because the developer has not updated it.
I want to contact the developer and get it updated or purchase it.  There is no trace of it on my phone.  How do I find the contact information for the developer?  This app looks likes gold plates with a black background.
Open your App Store purchase list and find the app on that list. From there you can find the developer information and try to download it again (or see why it disappeared).