You can find your Cloze API Key in Cloze Pro settings.
1.) Go to Cloze.com and then Tap on More (...) in the lower left of your screen on cloze.com.
2.) Tap on Settings.
3.) Tap on API Key to expand the section and tap on the Add button.
4.) For each API Key you can add a label. This is helpful when you want to know which key is being used for each app you connect. It also helpful if you need to delete your temporarily remove access to a key.