The fees for Patreon patrons through the iOS app suck. If your patrons have to pay the extra cost it ends up being 40-50% more for them. If you eat the cost, it ends up being a 30% loss in your earnings. On top of that, iOS has a 75 day holding period before your earnings are released.
So whats the most direct way to encourage patrons to NOT USE the iOS app payment system? Offer a direct link for each reward tier in the reward description. When the user clicks on this link, it opens in the browser, not the iOS app, letting the user bypass the whole iOS payment system.
Get your checkout link for an individual reward: In order to make this link, you need your Patreon page name and the reward id.
https://www.patreon.com/checkout/YOUR_PAGE_NAME?rid=YOUR_REWARD_TIER_ID
Edit your reward description as html and add the direct link
<p>Whatever your reward tier description is.</p>
<p></p>
<p>iOS app users: This reward is only $1/mo if you sign up through your web browser instead of the app: <a href="https://www.patreon.com/checkout/YOUR_PAGE_NAME?rid=YOUR_REWARD_TIER_ID">Checkout in your browser</a></p>