One-time payment for ad-free is live in Beta 25. It's $19.99 USD. Update your app if you don't see it.
Tap the account switcher in the top left corner and you should see the option.
See my comment for a screenshot. I don't know why I can't seem to post a screenshot in the body of post. Every time I try it gets removed.
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Really slick and professional looking app but, you gotta make price adjustments for the purchasing power. Especially for the ad removal option. My income and ad revenues you will be getting from me are way less than that of the US and EU users.