Unisender Integration: Subscription, Triggers, Synchronization

Your subscription form fails to send data to Unisender? Contacts duplicate on every registration? This is typical without proper integration. Errors in API requests, incorrect double opt-in settings, or missing server response handling lead to lost leads. We solve these tasks in 1 business day using the official REST API Unisender. Unisender is a Russian email marketing service with a simple API and high deliverability (up to 98% according to the service). It's suitable for transactional emails (order confirmations, password resets) and bulk campaigns. With our integration, you automate subscriptions, synchronization, and email campaigns without headaches. Over 30 projects completed.

How We Integrate Unisender in 1 Day

Connection starts with creating an API key in the Unisender account. We embed a subscribe call into your registration or order form. Example in PHP (Laravel):

$response = Http::post('https://api.unisender.com/ru/api/subscribe', [
    'format'         => 'json',
    'api_key'        => env('UNISENDER_KEY'),
    'list_ids'       => env('UNISENDER_LIST_ID'),
    'fields[email]'  => $email,
    'fields[Name]'   => $name,
    'double_optin'   => 3,  // 3 = без подтверждения, 4 = с подтверждением
    'overwrite'      => 1
]);

For transactional emails, we use the sendEmail method. We configure templates with dynamic variables. It's important to handle errors: for example, a timeout or invalid API key can break the chain. In one project, we found that 5% of emails failed during bulk sends due to an invalid API key — fixed by adding response code checks.

How Double Opt-In Works

Double opt-in is a standard subscription confirmation mechanism. With double_optin=4, Unisender sends a confirmation email with a link. Only after clicking does the contact enter the list. This eliminates spam complaints and improves deliverability. We customize the confirmation email template with your branding. In one case, this reduced unsubscribes by 30%.

Why Unisender Is Better Than Foreign Services

Unisender wins on price and no blocking, while functionality matches. Email automation with Unisender reduces manual effort.

What’s Included in the Work

• Subscription form setup (AJAX request with validation).
• Import of existing contact list (duplicate cleaning, validity checks). For a list of 10,000 contacts, import takes less than 5 minutes.
• Trigger sequences setup (welcome, cart abandonment, order confirmation). We segment by behavior: e.g., send promo emails on repeat visits.
• API documentation and employee training.
• 30-day integration warranty.

What Data We Sync

We transfer email, name, phone, and custom fields (city, interests, registration date). Data is secured via API key and HTTPS. During import, we automatically exclude invalid emails (regex check) and merge duplicates by email. In one project, this reduced the list by 15%, boosting deliverability.

Process of Work

1. Analysis: study your form, list, and email requirements.
2. Design: select API methods, data transfer scheme.
3. Implementation: write code on Laravel, test locally.
4. Testing: verify subscriptions, sync, triggers.
5. Deployment: upload to production server, train administrator.

Typical Integration Mistakes

• Invalid API key: ensure the key is active and has write permissions.
• Missing error handling: always check response code and log failed requests.
• Duplicate contacts: use overwrite=1 to update existing records.
• Timeouts during bulk import: split import into batches of 1000 contacts.

How We Guarantee Quality

We have extensive experience integrating Unisender, with over 30 completed projects. We provide a work warranty and post-delivery support. All data is encrypted using HTTPS.

Order integration — we will assess your project for free. Get a consultation from an engineer on Unisender setup.

Email Campaign Integration: Why Does It Often Break?

We’ve observed that a trigger email sent 10 minutes after registration converts 4–5 times better than the same email sent after 24 hours. This isn’t a marketing myth—it’s mechanics: while the user is still warm, while they remember the context. But most integrations with email services are built like this: form submits → synchronous HTTP request to API → if the API is slow, the user waits 3 seconds → the email either goes out or doesn’t, nobody knows. In one project, we saw a 30% drop in conversion simply because the email service responded with 504 and Laravel’s queue driver wasn’t configured. Lost emails often hit customers silently – no log, no alert, just a missing order confirmation.

If you’re facing lost emails or spam folder issues, order an audit of your current integration – we’ll find bottlenecks within 2 days.

Providers and Their APIs

Unisender — a Russian provider popular in the SMB segment. REST API, simple. Adding a contact: importContacts, sending a transactional email: sendEmail. Important: for transactional emails (order confirmations, password resets), Unisender Go is a separate service with a different API and separate pricing. Mixing bulk and transactional mailings in one stream is bad for domain reputation. Unisender Go handles up to 1000 requests per second.

SendPulse — provides email, SMS, web push, Viber, and Telegram bots through a unified API. Convenient for projects requiring an omnichannel approach. Automation 360 is a visual chain builder; you can trigger automation via API events. The PHP SDK (sendpulse/rest-api-php-sdk) is maintained but updated irregularly – better to use Guzzle directly.

Mailchimp — a choice for international audiences and marketing teams accustomed to the Mailchimp ecosystem. Transactional email via Mandrill (a subsidiary service). Marketing API v3 for list, tag, and campaign management. Webhooks for opens, clicks, unsubscribes, bounces.

SMS. For Russia: SMSCenter, MTS Exolve, Devino Telecom, SMS Aero. Their APIs are similar: a send method with phone, message, sender parameters (sender name must be registered separately with the operator). One nuance: the sender name must be registered through the aggregator with a contract – otherwise SMS won’t be sent on MTS/MegaFon/Beeline networks.

How to Build an Integration That Doesn’t Lose Emails?

Separate Transactional and Marketing Streams

Transactional emails (order confirmations, password resets, delivery status) go through a dedicated sender domain or subdomain tx.example.com. Marketing campaigns go through mail.example.com or news.example.com. If a marketing campaign receives many spam complaints, it should not affect the reputation of the transactional stream. According to SendGrid documentation, transactional messages should be sent through a dedicated IP pool to prevent cross-contamination.

Queue and Retry

Any call to the email API goes through a queue (Laravel Queue, Bull, Celery). If Unisender returns a 503, the job retries after 5 minutes, then 15, then 60. After 5 failed attempts, it goes to a dead letter queue with an alert. The user already received their 200 OK and knows nothing about the issue. This approach reduces bounce rate on projects to 0.5%.

Example Laravel job:

public function handle(): void
{
    try {
        $response = Http::post(config('services.unisender.email_url'), $this->params);
        if ($response->failed()) {
            $this->release(300); // retry after 5 min
        }
    } catch (\Throwable $e) {
        $this->release(300);
    }
}

Templates

We store templates in code (Blade, Twig, React Email), not in the provider’s interface. Reasons: versioning via Git, browser preview without sending, testability. For complex templates with dynamic content — react-email with export to HTML via @react-email/render.

Validation and Consent

Before adding a contact to a list — double opt-in (confirmation email). Store the confirmation timestamp in your own database. Upon unsubscription — synchronously unsubscribe both at the provider and in your database. Ignoring webhook unsubscriptions is a direct path to account suspension at the provider. All processes comply with Федеральный закон № 152-ФЗ «О персональных данных».

Deliverability Monitoring and DKIM Setup

Connect provider webhooks for events: bounce (hard and soft), spam_complaint, unsubscribe. Hard bounce — immediately mark the email as invalid in your database, stop sending. Soft bounce 3 times in a row — same. Metrics: open rate, click rate, bounce rate, unsubscribe rate — review at least once a week. Our certified engineers configure alerts in Grafana/Prometheus.

DKIM configuration steps:

1. Generate a key pair (e.g., openssl genrsa -out private.key 2048).
2. Publish the public key in DNS as a TXT record for the selector (e.g., mail._domainkey.tx.example.com).
3. Provide the selector to the provider (SendGrid, Mailgun, Unisender).
4. Verify with dig TXT mail._domainkey.tx.example.com.

SPF, DKIM, DMARC must be configured separately for each stream. We use subdomains with different DNS records.

Why Is It Important to Separate Streams?

If you send a marketing campaign from the same domain as transactional emails and receive spam complaints, you risk getting the domain blocked — and users will stop receiving even order confirmations. SPF, DKIM, DMARC (Sender Policy Framework, DomainKeys Identified Mail, Domain‑based Message Authentication, Reporting and Conformance) must be configured separately for each stream. In one project, a marketing blast with 12% spam complaints blocked the transactional domain for 48 hours — we had to re‑authenticate with Google and Yandex.

What Does the Integration Scope Include?

• Audit of current communication streams and domain reputation (SPF, DKIM, DMARC)
• Provider and schema selection: transactional vs marketing traffic
• Configuration of SPF, DKIM, DMARC DNS records
• Development of email templates (HTML + dynamic content)
• Backend integration via queues and API
• Webhook setup for deliverability and complaints
• Operations documentation and team training
• Deliverability guarantee and post‑launch support

We deliver production‑ready documentation, access to monitoring dashboards, and a handover session with your engineers. Our certified engineers provide a 30‑day post‑launch health check guarantee.

Timelines and Cost

Cost is calculated individually after audit. We provide turnkey service: from analysis to production monitoring. Contact us for a free engineer consultation — we’ll evaluate your project and give accurate timelines. Over 7 years of experience in email service integration, 50+ projects implemented. Order a free audit of your current integration and receive a report with recommendations and estimated savings.