Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
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.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type
Plivo - Plivo simplifies your customer engagement.
Stripe Billing Customer Portal - Stripe-hosted page for customers to manage subscriptions