API Keys & Scoped Credentials

Manage REST API authentication tokens, scoped permissions, IP allowlists, and SMTP credentials

Live & Test API Keys
Prefix htc_live_ for production dispatch and htc_test_ for developer sandbox.
Dual Protocol Support
API Keys can be used both as Bearer tokens in REST API and as passwords for SMTP AUTH (LOGIN/PLAIN).
Granular Scopes & IP Binding
Restrict tokens to specific endpoints (email.send, suppressions.manage) and allowed source CIDRs.
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