PayWhirl

PayWhirl is a widget and tool that offers online recurring payments and subscription billing services. Put simply, it is about building software for you when nothing off the shelf fits.

The natural audience is companies with a specific process to automate. Alongside the main category they mention Billing and Payments. As a very small company team themselves (1 to 10 people), they tend to serve customers of a similar scale best. You will probably talk to the people who build it, which is great until you need 24/7 support.

PayWhirl is based in Ventura, California and around since 2013. Their site is app.paywhirl.com.

Before you commit, look at portfolio relevance, who owns the code, and how they handle changes. Ask for a trial on your own data, not a canned demo.

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