Mailgun Integration For Transactional Emails

My custom-built site already has an active Mailgun account waiting to be connected. The goal is simple: every order confirmation and account-related notification must leave the server through Mailgun, reach the customer’s inbox reliably, and appear as though it was sent right from my domain.

Here is what I need done:

• Domain verification and DNS entries (SPF, DKIM, tracking) completed and confirmed.
• API key securely added to the project’s environment file, never hard-coded.
• Code hooks inserted so Order Confirmation and Account Notification events trigger Mailgun sends.
• Template(s) created or migrated for those two email types, with variables pulling live data.
• End-to-end test for each flow, including a bounce/complaint check, to show everything is working.

I will provide server access, the Mailgun account, and sample payloads. A quick hand-off guide or brief comments in the code will be appreciated so I can maintain it later.