Short answer: Yes.
Long answer from the FAQs:
If I release a commercial product, what royalties are due to Epic, and when?
Generally, you are obligated to pay to Epic 5% of all gross revenue for your product, regardless of what company collects the revenue. For example, if your product earns $10 from sales on the App Store, the royalty due is $0.50 (5% of $10), even though you would receive roughly $7 from Apple after they deduct their distribution fee of roughly $3 (30% of $10).
What about downloadable content, in-app purchases, microtransactions, virtual currency redemption, and subscription fees, as well as in-app advertising and affiliate program revenue?
Revenue from these sources is included in the gross revenue calculation above.
Take a look over the FAQs as there is more information there regarding Royalties.