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 as00or001. - 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.