Tiers allows you to integrate SaaS subscription management into your app with just 2 API calls.
I personally wouldn't pay 25$ a month. Seems like a great idea. Take a look at what Fiverr, is doing over at www.And.co. It's completely free, massive domain authority, and giving back to the community. If you have apps, which were the brainchild, Give it away free! If not free, possibly, $3.99/mth as an Addon, or $4.99/mth as a standalone. Another option, $35/yr like the folks at Droplr have done. I still think it should be completely free. #giveback
Simple, and effective!
25$ a month, seems steep for an API integration. #giveback to the community. FREE.