Square + Mailchimp
Connect Square and Mailchimp to Turn Every Transaction Into a Marketing Opportunity
Automatically sync your Square customer and sales data with Mailchimp to run smarter, more personalized email campaigns.
Why integrate Square and Mailchimp?
Square and Mailchimp are two of the most widely used platforms for small and mid-sized businesses — one handling payments and point-of-sale, the other driving customer engagement through email. When they run in isolation, purchase data never reaches your marketing team and email lists fall out of date fast. Integrating Square with Mailchimp on tray.ai closes that gap so every new customer, completed sale, and product purchase automatically feeds your email marketing strategy.
Automate & integrate Square & Mailchimp
Use case
Auto-Add New Square Customers to Mailchimp Audiences
When a new customer completes their first purchase in Square — in-store or online — their contact information goes straight into the right Mailchimp audience. Your email list grows in real time alongside your customer base, no manual imports needed. New subscribers can be enrolled in a welcome series immediately to start building the relationship.
Use case
Trigger Post-Purchase Email Sequences Based on Square Transactions
After a customer completes a Square transaction, tray.ai can fire a targeted post-purchase workflow in Mailchimp — sending a thank-you, requesting a review, or suggesting related products. These automations tie to specific Square product categories or spend thresholds, so they stay relevant. Timely follow-ups do a lot for repeat purchase rates.
Use case
Segment Mailchimp Audiences by Square Purchase Behavior
Use Square transaction data to dynamically segment your Mailchimp audiences by total spend, purchase frequency, product preferences, or last purchase date. High-value customers move into a VIP segment while one-time buyers get nurture campaigns designed to encourage a second purchase. Better segmentation means every subscriber gets messaging that matches their actual relationship with your brand.
Use case
Re-Engage Lapsed Customers with Win-Back Campaigns
tray.ai can monitor Square transaction history to identify customers who haven't bought within a defined window — say, 60 or 90 days — and automatically enroll them in a Mailchimp win-back campaign. These emails can include special offers, personalized product recommendations, or a simple friendly check-in. Recovering even a small percentage of lapsed customers adds up.
Use case
Sync Square Loyalty Program Data to Mailchimp Tags
For businesses using Square Loyalty, tray.ai can sync loyalty tier and point balance data into Mailchimp as subscriber tags or custom fields. That lets you send exclusive emails to loyalty members, notify them when they hit points milestones, or promote tier upgrade opportunities. Loyalty-driven email campaigns consistently outperform generic blasts on open and conversion rates.
Use case
Update Mailchimp Subscriber Profiles with Latest Square Purchase Data
Keep Mailchimp subscriber records accurate and enriched by continuously syncing updated purchase data from Square — including last purchase date, total order count, and preferred product categories. Richer subscriber profiles mean smarter send-time optimization, better A/B test segmentation, and more relevant dynamic content. Your marketing team always has a current, complete view of each customer.
Use case
Notify Mailchimp Lists When Square Inventory or Promotions Change
When you update pricing, launch a promotion, or restock a popular item in Square, tray.ai can automatically trigger a targeted Mailchimp campaign to the most relevant audience segment. Customers who previously bought that product get notified first, driving urgency and higher conversion rates. Your inventory management and email calendar finally talk to each other.
Get started with Square & Mailchimp integration today
Square & Mailchimp Challenges
What challenges are there when working with Square & Mailchimp and how will using Tray.ai help?
Challenge
Keeping Mailchimp Lists in Sync with a Continuously Growing Square Customer Base
Square processes transactions constantly — in-store, online, and through mobile — meaning new customers are created at all hours. Manually exporting and importing customer lists even once a day creates real gaps where new buyers get no welcome communication and marketing lists go stale.
How Tray.ai Can Help:
tray.ai listens for real-time Square customer creation events via webhooks and instantly pushes new contacts to Mailchimp, so list sync is continuous and automatic regardless of transaction volume or time of day.
Challenge
Avoiding Duplicate Subscribers and Conflicting Data Across Platforms
When customers make multiple purchases or shop across both in-store and online Square channels, it's easy to end up with duplicate Mailchimp subscribers carrying incomplete or conflicting data. Duplicate records skew campaign metrics and mean the same person gets redundant or contradictory emails.
How Tray.ai Can Help:
tray.ai includes built-in deduplication logic that checks for existing Mailchimp subscribers by email before creating new records, then merges or updates existing profiles with the latest Square data rather than spinning up conflicting duplicates.
Challenge
Mapping Square's Transaction Data to Meaningful Mailchimp Segments
Square stores purchase data including product SKUs, categories, spend totals, and visit frequency — but Mailchimp works with audiences, tags, and custom fields. Translating one system's data model into the other requires custom logic that's hard to maintain manually, especially as product catalogs and audience structures change.
How Tray.ai Can Help:
tray.ai's visual workflow builder lets you define exactly how Square transaction attributes map to Mailchimp custom fields and tags, with transformation logic you can update in minutes — no code, no engineering tickets.
Challenge
Preventing Promotional Emails from Reaching Customers Who Just Requested a Refund
Without real-time sync, a customer who submits a refund request through Square may still receive a glowing promotional email from Mailchimp hours later. It's a bad experience that can trigger unsubscribes or complaints — and it's entirely avoidable.
How Tray.ai Can Help:
tray.ai monitors Square for refund and cancellation events and immediately updates or suppresses the corresponding Mailchimp subscriber's active campaigns, so customers in a dispute or refund state never get tone-deaf marketing emails.
Challenge
Scaling Email Personalization Without Increasing Manual Effort
As a business grows its Square customer base, maintaining personalized Mailchimp campaigns manually — hand-segmenting lists, applying tags, updating custom fields — becomes unsustainable. Teams either drop personalization to save time or burn hours on repetitive data hygiene.
How Tray.ai Can Help:
tray.ai automates the entire data pipeline between Square and Mailchimp at scale, continuously enriching subscriber profiles with the latest purchase data so every campaign benefits from accurate personalization without extra manual effort from the marketing team.
Start using our pre-built Square & Mailchimp templates today
Start from scratch or use one of our pre-built Square & Mailchimp templates to quickly solve your most common use cases.
Square & Mailchimp Templates
Find pre-built Square & Mailchimp solutions for common use cases
Template
New Square Customer → Add to Mailchimp Audience
Automatically adds every new Square customer to a specified Mailchimp audience and optionally enrolls them in a welcome email journey, eliminating manual list imports entirely.
Steps:
- Trigger when a new customer record is created in Square
- Check if the customer's email already exists in the target Mailchimp audience to prevent duplicates
- Add or update the Mailchimp subscriber with name, email, and purchase source tags
Connectors Used: Square, Mailchimp
Template
Completed Square Sale → Trigger Mailchimp Post-Purchase Email
Fires a targeted Mailchimp email automation whenever a Square order is marked as completed, enabling immediate thank-you messages, review requests, or upsell campaigns based on what was purchased.
Steps:
- Trigger when a Square order status changes to completed or paid
- Extract customer email, purchased items, and order total from the Square payload
- Add or tag the subscriber in Mailchimp and trigger the relevant post-purchase automation sequence
Connectors Used: Square, Mailchimp
Template
Square Lapsed Customer → Mailchimp Win-Back Campaign Enrollment
Runs on a schedule to identify Square customers who haven't purchased within a set timeframe and automatically enrolls them in a Mailchimp re-engagement campaign with a personalized offer.
Steps:
- Run on a daily or weekly schedule and query Square for customers with no orders in the past 60–90 days
- Filter out customers already enrolled in an active Mailchimp win-back journey
- Add the qualifying customers to a Mailchimp win-back audience segment and trigger the campaign
Connectors Used: Square, Mailchimp
Template
Square Purchase History → Mailchimp Audience Segmentation Sync
Periodically syncs Square customer spend data into Mailchimp custom fields and tags so audiences stay accurately segmented by purchase frequency, lifetime value, and product affinity.
Steps:
- Schedule a daily sync that pulls updated customer transaction summaries from Square
- Calculate metrics per customer: total spend, order count, last purchase date, top product category
- Update corresponding Mailchimp subscriber custom fields and tags to reflect the latest segmentation data
Connectors Used: Square, Mailchimp
Template
Square Loyalty Milestone → Mailchimp Reward Email
Detects when a Square Loyalty customer reaches a points milestone or tier upgrade and automatically sends a personalized Mailchimp email marking the achievement and presenting an exclusive reward.
Steps:
- Trigger when a Square Loyalty event fires indicating a points threshold or tier change
- Retrieve the customer's contact details and loyalty status from Square
- Send a personalized Mailchimp campaign or transactional email with the milestone reward details
Connectors Used: Square, Mailchimp
Template
Square Refund or Cancellation → Update Mailchimp Subscriber Tags
Keeps Mailchimp subscriber data accurate by detecting Square refunds or cancelled orders and adjusting the subscriber's tags, segment membership, or suppression status to prevent ill-timed promotional emails.
Steps:
- Trigger when a refund or order cancellation event is recorded in Square
- Look up the corresponding subscriber in Mailchimp by email address
- Remove purchase-related tags, adjust segment membership, or pause active campaign sequences for that subscriber
Connectors Used: Square, Mailchimp