Vonage API Help Center Vonage API Help Center

Messages API

Email

Email channel in Messages API

Vonage Email API – Frequently Asked Questions(FAQ)

Logs and Analytics
Understanding Messaging Analytics Statuses

Account Settings
What is the Messages API sandbox rate limit?
Why do I receive pricing on all outbound Whatsapp messages that are part of a Conversation?
Why am I getting Unsupported Type Messages API callbacks?
What do are the technical requirements needed to implement the Messages API?
How long does Vonage retry inbound messages for the SMS and Messages API?
Which webhook is used for Messages API?

Channels
Why am I getting 401 Unauthorized error when sending messages with Messages API version 1?
How to test or register for a channel on the Messages API?

MMS
How do I check attachment file is supported content type
Is 2-Way message supported for MMS?
MMS FAQ
MMS Features and Restrictions
Unsupported Content type on Inbound MMS to 10DLC Numbers
What are the throughput limits on MMS?
See all 8 articles

SMS
Price of a multi segment SMS Text Message is different on the SMS API logs verses the Messages API logs
Why am I not receiving inbound SMS to my Vonage Application Webhook?
Can you stop unwanted inbound messages from non-Vonage number ?
How do I register to send messages using SMS via the Messages API?
Is Unicode supported with the SMS channel on the Messages API?

Facebook Messenger
How do I register to send messages using Facebook Messenger via the Messages API?

Viber
Error 1260 Destination Unreachable When Using Viber
Getting Started with Viber and Vonage Messages API
How do I register to send messages using Viber via the Messages API?

WhatsApp
Unable to Create a New Meta Business Portfolio — Creation Limit Reached
How to Create a WhatsApp Authentication Template?
Guidelines and Eligibility Criteria for Creating a WhatsApp Authentication Template
WhatsApp Service Messages Become Billable on Oct 1, 2026: What You Need to Know
Why is my WhatsApp Messaging Limit still at 250 and Display Name not visible after Business Verification?
WhatsApp Display Name – Approval, Review & Appeal Process
See all 76 articles