This is Finley from the Social Care team at Shopify.
Thanks for your question! To clarify, do you need to see the total of your Shopify Payments fees for the month, or are you requesting that the fees be on your monthly invoice?
Currently, to see your Shopify payments fees by month, the best method would be to export your payouts into a CSV file.
You can do this from your Shopify admin > Settings > Payments > Shopify Payments > View Payouts:
You can then click Actions > Export to select your payouts by date:
I'm happy to get some clarification about if you're hoping to see your Shopify Payments fees with your monthly invoice? If so, what I can do is gather some information from you, and submit a feature request on your behalf. Our developers are always reviewing the features that are requested. Let me know if you'd like me to move forward with this.
I hope you're having a wonderful day!