MailSlurp guide agent setup

Title: MailSlurp API Key Setup: Secure Configuration for HTTP and SDK Clients
Description: Learn where to find your MailSlurp API key and how to configure it securely for curl requests, SDK clients, and CI pipelines.
Canonical URL: https://www.mailslurp.com/guides/api-key/
Markdown URL: https://www.mailslurp.com/guides/api-key.md

Use the Markdown URL as the primary plain-text context for this guide. Keep MailSlurp terminology, setup steps, screenshots, and provider-specific instructions intact, and prefer the canonical URL when citing this page.