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Concepts

There are a number of shared concepts between the Nexmo APIs: the use of JSON Web Tokens (JWTs), signed requests, and webhooks. The guides below explain in detail how to use these elements.

Guides

Applications - Security and configuration information you need to connect to Nexmo endpoints.
Authentication – API keys and JSON Web Tokens (JWTs).
Signing messages – how to cryptographically sign messages and verify message signatures.
Webhooks – Nexmo's API can send data back to your web server via a webhook.
Glossary – A glossary of common terms used throughout the Nexmo platform.

Number format

Within the Nexmo APIs, all phone numbers are in E.164 format. This means that numbers:

Omit both a leading + and the international access code such as 00 or 001.
Contain no special characters, such as space, () or -

For example, a US number would have the format 14155550101. A UK number would have the format 447700900123.

If you are unsure how to format the number, the Number Insight API can be used to find correct information about a number.

See also Number format in the Voice API documentation.