Lookup by Twilio - Know the details behind every phone number
PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
Ring4 - Manage business phone line as easily as you manage emails, in the cloud. Ring4 provide you with a business line and video conferencing solution.
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.
Shuffle - One Phone, Multiple Numbers
Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.