intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
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
MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
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.
SolveDNS - SolveDNS works to check your name servers, a records, and mail servers, SOA records for errors, consistency, efficiency and speed using several DNS tests.
Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.