How to add Submarine Flow Properties to Klaviyo Templates

• Overview
• Prerequisites
• Step 1: Verify Data is Coming Through
• Step 2: Create the Flow in Klaviyo
• Step 3: Create/Select Your Email Template
• Step 4: Add Event Properties to Your Template
• Step 5: Find Property Names in Shopify Flow
• Step 7: Testing Your Flow
• Adding a Filter for Testing
• Running a Test

Overview

This guide walks you through how to add event properties from Submarine's Shopify Flow into your Klaviyo email templates for subscription notifications.

Prerequisites

• Submarine integration set up in Shopify
• Klaviyo account connected to Shopify
• Flow already configured to send subscription events to Klaviyo
• Note: to get the Event properties to show you will have to have had the event fire into Klaviyo once or twice.

Step 1: Verify Data is Coming Through

Before building your email template, confirm that Submarine is sending data to Klaviyo:

1. In Klaviyo, navigate to Analytics > Metrics
2. Filter by Shopify Integrations using the dropdown
3. Scroll to find the Upcoming Subscription Order metric

4. Click on a recent activity and select the three dots → Activity Details

5. Verify you can see data like:
• Next delivery date
• Total price
• Currency
• Product information
6. If no data is showing then there is an error with the Flow. Please reach out to Submarine support for help.

Step 2: Create the Flow in Klaviyo

Important: You need to create the flow first before the email template can access the event properties.

1. Go to Flows in Klaviyo
2. Create a new flow with the trigger set to your subscription event (e.g., "Upcoming Subscription Order")
3. Add an Email action to the flow
4. Save the flow as a Draft (this prevents it from sending while you're testing)

Step 3: Create/Select Your Email Template

1. In the flow you just created, select or create your email template
2. This connection allows the template to access the event properties from the metric

Step 4: Add Event Properties to Your Template

1. Click into a text block in your email template
2. Highlight some text or position your cursor in the area you want the data to be.
3. Look for Personalization in the top toolbar (next to the emoji icon)
4. Filter properties to Event
5. In the drop down click View all event properties

6. Click and copy the full property path (it will look like {{ event.property_name }})

7. Paste this directly into your email template where you want the data to appear
8. Some data will need to be filtered and displayed correctly, for example we send dates in ISO format so to get these to look nice you will have to add extra data to the property path. Example for Upcoming Billing at, this would be: {{ event.subscriptionUpcomingOrderExpectedBillingAt|datetime_from_string }} this will show as : Jan. 21, 2026, 2:12 p.m.

9. For any help with filtering data please reach out or review Klaviyos documents here

Step 5: Find Property Names in Shopify Flow

If you need to know what properties are available:

1. Go to Shopify > Flow
2. Open the Submarine flow template
3. Click on the Track Event action
4. Review the Event Property labels - these are the exact property names you'll use in Klaviyo

Common properties include:

• subscriptionExpectedDelivery - Next delivery date
• subscriptionTotalPrice - Order total
• subscriptionStatus - Customer subscription status

Note: Property labels are consistent across emails, so subscriptionStatus will be the same in all your templates!

Step 7: Testing Your Flow

Adding a Filter for Testing

Before going live, add a filter to prevent sending to all customers:

1. In your Shopify or Klaviyo flow, add a Conditional Split or Filter
2. Set it to only trigger for your own email address
3. This allows you to test without emailing customers

Running a Test

1. Ensure the flow is set to Live (required for testing)
2. Go to Recent Runs in the Flow
3. Select from the last Flow Run
4. Click the three dots and select Retry Run
5. Check your inbox for the test email
6. Verify all properties are displaying correctly