Shopify Plus checkout SSL failures
stop enterprise revenue in minutes.
Shopify Plus agencies build enterprise stores where the checkout subdomain is the highest-revenue page in the stack. SSL failures on custom checkout domains block purchases for every visitor until fixed. Client nameserver migrations break Shopify CDN CNAME delegations without any platform notification. Merlonix monitors the full SSL and DNS layer so checkout pages stay clean during client infrastructure changes.
No credit card either way — start free, or trial the full workspace.
- Check cadence (Agency)
- 1 min
- SSL pre-expiry alert
- 30 days
- Encrypted DNS lookups
- DoH
- Vendors watched
- 11
Where Shopify Plus agencies get caught out
Three failure modes specific to Shopify Plus client portfolios.
Shopify Plus agencies manage enterprise client stores where SSL failures on checkout subdomains have an immediate and calculable revenue impact. The complexity of enterprise DNS configurations and headless architectures adds monitoring surface that standard uptime tools do not cover.
Custom checkout SSL failure
SSL failures on Shopify Plus checkout subdomains block enterprise-scale revenue
Shopify Plus enables custom checkout subdomains — checkout.clientbrand.com or buy.clientbrand.com — via CNAME delegation to Shopify's CDN. When SSL provisioning for the checkout subdomain fails or the certificate expires, browsers display a blocking security warning on the highest-traffic page in the purchase flow. Enterprise clients running paid traffic campaigns lose every conversion in the window between SSL failure and fix. The revenue impact at Shopify Plus scale is measured in thousands per hour.
CNAME delegation drift
Client nameserver migrations break Shopify CDN delegation without notification
Shopify Plus stores point custom domains to Shopify via CNAME records delegating to shops.myshopify.com. When enterprise clients migrate nameservers — moving to Cloudflare, consolidating DNS management, or switching IT providers — the CNAME records must be manually recreated at the new provider. In large IT migrations, the storefront and checkout subdomains are often recreated correctly while secondary subdomains (the account portal, partner-specific pages, or regional subdomains) are missed and break independently.
Headless storefront complexity
Headless Shopify Plus implementations add CDN origin and API subdomain monitoring surface
Shopify Plus agencies implementing headless storefronts (Next.js, Nuxt, Hydrogen) introduce additional DNS surface: a CDN origin subdomain, a Shopify Storefront API subdomain, and often separate staging and production environments on distinct subdomains. Each requires its own SSL certificate and DNS delegation. A configuration change in the CDN origin layer — incorrect CNAME after an edge provider migration, or a misapplied Terraform change — can break the storefront while the Shopify admin itself stays online, complicating diagnosis.
How it works
SSL and DNS monitoring for every Shopify Plus client domain.
Merlonix is designed for agencies managing enterprise Shopify Plus client portfolios where checkout SSL failures have immediate revenue impact and headless architectures add DNS complexity that standard uptime monitoring misses entirely.
01
Add storefronts, checkout subdomains, and headless origins
Verify ownership with a DNS TXT record for the apex domain. Checkout subdomains, headless CDN origins, API endpoints, and staging environments are added without additional verification. One verification per client apex domain. Takes under two minutes per client.
02
SSL chain validation with immediate failure alerts
Full certificate chain monitoring for every subdomain in the client's Shopify Plus configuration — storefront domain, checkout subdomain, headless CDN origin, and any regional subdomains. SSL provisioning failures and chain validation errors fire immediately. Expiry warnings fire 30 days ahead.
03
CNAME integrity monitoring for Shopify CDN delegations
A DNS-over-HTTPS resolver verifies every CNAME delegation on every check interval. When a client's IT migration drops a checkout subdomain CNAME or points it to the wrong Shopify CDN target, the alert fires within minutes — before any enterprise buyer encounters a failed checkout page.
04
Vendor status correlation for Shopify platform incidents
Merlonix monitors Shopify's platform status alongside client-side SSL and DNS. When a Shopify infrastructure incident affects checkout processing, you see the vendor event correlated with client-side symptoms — eliminating the first phase of investigation where the agency tries to determine whether the problem is client configuration or platform infrastructure.
What the numbers mean for Shopify Plus agencies
Monitoring built for enterprise commerce client infrastructure.
Shopify Plus agencies manage enterprise client stores where checkout SSL failures have calculable, immediate revenue impact. Merlonix gives Shopify Plus agencies the lead time and signal depth to protect revenue-critical checkout infrastructure.
< 10 min
Time from DNS change to alert — catches Shopify CDN CNAME drift before any checkout buyer encounters the failure
30 days
SSL expiry warning lead time — time to resolve provisioning issues on Shopify Plus custom domains before revenue impact
11 vendors
Upstream services monitored — Shopify platform status included to distinguish client configuration issues from platform infrastructure incidents
250 assets
Maximum monitored domains on the Agency plan — covers storefronts, checkout subdomains, and headless origins across a full Shopify Plus client roster
Pricing
Flat monthly fee. Every domain and subdomain included.
No per-domain charges. No per-subdomain fees. Pick the tier that fits your Shopify Plus client count and grow without billing surprises.
Starter
For consultants managing a small number of Shopify Plus client accounts.
$19/ month
- 15 monitored assets
- 3 seats
- 5 min check cadence
- SSL + DNS + vendor monitoring
- Email + Slack alerts
Team
For Shopify Plus agencies with multiple enterprise client storefronts.
$79/ month
- 60 monitored assets
- 10 seats
- 1 min check cadence
- SSL + DNS + vendor monitoring
- Email + Slack alerts
Agency
For agencies with a full Shopify Plus roster including headless storefronts and checkout subdomains.
$199/ month
- 250 monitored assets
- Unlimited seats
- 1 min check cadence
- SSL + DNS + vendor monitoring
- Email + Slack alerts
Compliance
For regulated-vertical teams that need continuous, audit-ready evidence.
$699/ month
- 500 monitored assets
- Unlimited seats
- 1 min check cadence
- SSL + DNS + vendor monitoring
- Email + Slack alerts
Beyond uptime
More than a 200 OK on every client site
The same account also watches the infrastructure and reputation layers a standard uptime check never reaches — each a live check you can turn on.
Turn monitoring into revenue
Resell client-ready reports as your own
Monitoring doesn’t have to be a cost line. Package the branded report and white-label status page as a deliverable in your retainer — the tooling underneath stays invisible, so to the client the work is yours.
Reports under your brand
Hand each client a polished SSL, DNS, and security report carrying your agency’s name and logo — not ours.
Status pages on their domain
Publish a live status page at status.theirbrand.com with automatic TLS and no “Powered by Merlonix” badge.
Your margin to keep
You pay one add-on cost and package it into the retainer you already bill. The markup — and the margin — are yours.
Common questions
Frequently asked questions
Do I need DNS or registrar access to my clients’ domains to monitor them?
No. Merlonix monitors from the outside in — it probes each domain’s public SSL certificate, DNS records, WHOIS/registration data, and HTTP responses the same way a browser or DNS resolver would. You add an asset by its hostname; no access to the client’s registrar, DNS provider, or servers is required.
What does Merlonix actually check on each site?
Every monitored asset gets continuous SSL-certificate (expiry, issuer, and chain changes), DNS-record, domain-registration/expiry, and uptime monitoring by default. You can also enable infrastructure and reputation checks a standard uptime monitor never reaches — security headers, DNSSEC/DANE, domain-hijack/registrar-lock, blocklist, and cron/heartbeat monitoring — each a live check you turn on per asset.
How often does it check, and how do alerts reach me?
Checks run on your plan’s cadence — as often as every 1 min on Team and above, and every 5 min on Starter. When a certificate, DNS record, registration, or response changes, you get an alert by email and Slack. Alerts fire on real state changes between definitive checks, not on a transient blip.
How much does it cost, and is there a free option?
Yes — there is a free $0 plan (no credit card) to watch a small number of assets, and paid plans start at $19/mo (Starter). You can also start a 14-day full-workspace trial with no card. See the pricing grid above for the assets, seats, and check cadence on each tier.
Know before the enterprise checkout fails.
Add your first Shopify Plus client domain in under two minutes. The first SSL or DNS alert tells you whether monitoring was worth it — usually within the first week. 14-day trial, no card required.