> ## Documentation Index > Fetch the complete documentation index at: https://apidoc.mailercloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Send transactional email > Send order confirmations, OTPs, and notifications with the Mailercloud Email API from PHP, Node.js, or any HTTP client. Transactional emails (order confirmations, password resets, OTPs) use the dedicated **Email API** at `https://email-api.mailercloud.com` — separate from the campaign API. Set `version` to `"1.0"` when sending `html` only, or `"2.0"` when including `amp_html`. ```bash cURL theme={null} curl --request POST \ --url https://email-api.mailercloud.com/email \ --header 'Authorization: YOUR_API_KEY' \ --header 'Content-Type: application/json' \ --data '{ "version": "1.0", "email": { "from": "orders@yourdomain.com", "fromName": "Acme Store", "subject": "Your order is confirmed", "html": "

Thanks for your order!

", "text": "Thanks for your order!", "recipients": { "to": [{ "name": "Jane", "email": "jane@example.com" }] } } }' ``` ```php PHP theme={null} '1.0', 'email' => [ 'from' => 'orders@yourdomain.com', 'fromName' => 'Acme Store', 'subject' => 'Your order is confirmed', 'html' => '

Thanks for your order!

', 'text' => 'Thanks for your order!', 'recipients' => [ 'to' => [['name' => 'Jane', 'email' => 'jane@example.com']], ], ], ]; $ch = curl_init('https://email-api.mailercloud.com/email'); curl_setopt_array($ch, [ CURLOPT_POST => true, CURLOPT_RETURNTRANSFER => true, CURLOPT_HTTPHEADER => [ 'Authorization: YOUR_API_KEY', 'Content-Type: application/json', ], CURLOPT_POSTFIELDS => json_encode($payload), ]); $response = curl_exec($ch); curl_close($ch); echo $response; ``` ```javascript Node.js theme={null} const response = await fetch("https://email-api.mailercloud.com/email", { method: "POST", headers: { Authorization: "YOUR_API_KEY", "Content-Type": "application/json", }, body: JSON.stringify({ version: "1.0", email: { from: "orders@yourdomain.com", fromName: "Acme Store", subject: "Your order is confirmed", html: "

Thanks for your order!

", text: "Thanks for your order!", recipients: { to: [{ name: "Jane", email: "jane@example.com" }], }, }, }), }); console.log(await response.json()); ``` ## Per-recipient personalization (mail merge) To personalize each recipient's email in a single request — `Hi {{first_name}}, your order {{order.id}} shipped` — use the [mail merge endpoint](/api-reference/email/send-personalized-email): same request structure at `POST /email-api`, plus a `merge_vars` object on each `recipients.to[]` entry. ## Attachments Pass an `attachments` array with a `name` and a publicly fetchable `url` per file — see the [full reference](/api-reference/email/send-email).