A confirmation should appear within the Work Portal after selecting "Connect with Stripe". You will not be allowed to work within the portal without completion of this integration, thus, if you're able to navigate through the portal, this should mean you are all set to go. Reference this article to learn how to connect your account with Stripe.
That being said, if you're interested in confirming the 3rd parties with which your Stripe has integrated, you may go to your Stripe account and select "Connect" on your "Account Settings" (drop-down next to your name on the top right of your Stripe dashboard). If you have successfully integrated your account, you should see Taxfyle listed within connected applications.