Ash here from the Shopify team. Welcome to the Shopify Community!
The information you're looking for is available right in your Shopify admin. You can find your monthly charges from Shopify, including shipping fees and app charges from your Settings> Billing> Finance Overview (Finance Overview is found at the bottom of the Billing Settings page). Here is a screenshot of what this section looks like:
Additionally, above the Finance Overview section, you can take a look at all of the billing history for your account in the Bills section. This allows you to see each individual bill you've received from Shopify.
Do you have any questions regarding specific charges on your Shopify account? Let me know by replying here if there's anything else I can assist with. I'm happy to continue our conversation and provide any information you need.