Authenticating the API Request
Token authentication is required to call an ESM API.
Token Authentication

The validity period of a token is 24 hours. When using a token for authentication, cache it to avoid frequently calls to the API.
A token specifies temporary permissions in a computer system.
During API authentication using a token, the token is added to a request to get permissions for calling the API. Obtain it by calling the API for obtaining a user token.
A cloud service can be deployed as either a project-level service or global service, where,
- For a project-level service, obtain a project-level token. When you call the API, set auth.scope in the request body to project.
- For a global service, obtain a global token. When you call the API, set auth.scope in the request body to domain.
Message & SMS is a project-level service. When you call the API for obtaining a user token, set auth.scope in the request body to project.
{ "auth": { "identity": { "methods": [ "password" ], "password": { "user": { "name": "username", "password": "********", "domain": { "name": "domainname" } } } }, "scope": { "project": { "name": "xxxxxxxx" } } } }
After a token is obtained, the X-Auth-Token header must be added to requests to specify the token when calling other APIs. For example, if the token is ABCDEFJ...., add X-Auth-Token: ABCDEFJ.... to a request as follows:
POST https://esm-api.cn-south-1.myhuaweicloud.com/meter/v1/{domain_id}/query-jobs Content-Type: application/json X-Auth-Token: ABCDEFJ....
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