Add Ready in Zapier, sign in, then build Zaps. The app connects with OAuth. (Its endpoints also accept an API key, but they're built for Zapier and aren't part of this API.)

• Triggers: New Inbound Message, New Contact, New Conversation, New Opt-Out, Message Delivered, Message Failed, Pipeline Stage Changed, Tag Added to Contact, Tag Removed From Contact, Keyword Reply, Drip Sequence Completed, Contact DND Changed.
• Actions: Send SMS, Create Contact, Update Contact, Add Tag to Contact, Remove Tag From Contact, Add to Drip Sequence.
• Searches: Find Contact, by phone first and then by email.