TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type

Stripe Billing Customer Portal - Stripe-hosted page for customers to manage subscriptions

PropelAuth - PropelAuth hosts and manages your authentication.

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

Authorizer - Authorizer is an open-source authentication and authorization solution for your applications.

Recurpay - Recurpay is a subscription SaaS app for businesses that automates recurring billing.