requirement for creating woocommerce store mobile application

I am going to create an mobile application for our woocommerce store. there is a good rest api for woocommerce but i have a problem there.

I need my application use some public data form my site, like list of categories and products. A guest use should be able to use my application without need to login or register on my site.

but for using woocommerce api, I need to define some keys and set them in application. but what about guest user? how he/she will be able to get that keys?

Am I wrong?

I use jwt plugin for wordpress authentication and after user logged in, there is no need to get that keys, thanks to woocommerce compatibility to wordpress authentication, but my problem is GUEST users that not logged in yet.

Does I need to write my rest api?