Excellent observation (and thanks for your comment!). We do want to expand to other providers.

We're starting with Stripe because we find it easier: we like the product, we're users ourselves, they already have a good market-size, and with Paypal, they're two of the payment processors used most by bootstrappers / small-biz / freelancers (which are the people we love creating tools for — people like us!).

The goal is two-fold:

1. Give simple tools to Stripe users to help them manage their business money. We're starting with giving them information about their cashflow (now the notifications, very soon aggregating multiple Stripe accounts under 1 app), and we'll follow with enabling them to act on various events (how to best manage a failed payment, help them through disputes, welcoming a new customer, etc.). (Maybe, one day, to close the loop, we envision being able to give them best practices depending on the business' state of maturity — a $200/m is not the same than a $2K/m is not the same than a $20K/m. That's if app is sustainable.)

2. After really nailing down features for Stripe users, we expand to other payment providers. We've already started reaching out to some of them, to see which ones would be the fastest for us to integrate.

The best way to help is to tell us how you think you're losing opportunities (or money) not or badly managing your Stripe account, and which other providers you'd vote to add into the app.