Shopify Flow with Variants — Automation Complete Guide

What Shopify Flow is

Free workflow automation tool from Shopify. Trigger-condition-action pattern:

• Trigger: Event that starts the workflow (Inventory quantity changed, Order created, Product updated, etc.)
• Condition: Filter (variant inventory < 5, product tag contains "hot", customer LTV > $500)
• Action: What to do (Send email, Add tag, HTTP webhook, Update product, etc.)

All Shopify plans since November 2022. Previously Plus-only. Install from Shopify App Store (free).

10 production-ready variant workflows

Workflow 1: Low-stock alert to purchasing team

• Trigger: Inventory quantity changed
• Condition: Variant inventory ≤ 5 AND variant tag = "reorder-priority"
• Action: Send internal email to purchasing@yourstore.com with variant details + current qty

Workflow 2: Auto-hide sold-out variant from featured

• Trigger: Inventory quantity changed
• Condition: Variant inventory = 0 AND product tag = "featured"
• Action: Remove product from "Featured" collection (via Update Product)

Workflow 3: Restock notification to subscribers

• Trigger: Inventory quantity changed
• Condition: Variant inventory changed from 0 to positive
• Action: HTTP POST to Klaviyo "back in stock" list for that variant

Workflow 4: Slack alert on high-value variant sold

• Trigger: Order created
• Condition: Order line item unit price ≥ $500
• Action: HTTP POST to Slack webhook with order + variant details

Workflow 5: Auto-tag customer as "personalized buyer"

• Trigger: Order created
• Condition: Order has line-item properties (personalized)
• Action: Add tag "personalized-buyer" to customer

Workflow 6: Weekly digest of low-stock variants

• Trigger: Scheduled (weekly)
• Condition: N/A (fires on schedule)
• Action: Run query for all variants with inventory ≤ 10; email digest to purchasing team

Workflow 7: Auto-adjust variant price on cost change

• Trigger: Product updated (variant cost field changed)
• Condition: Variant cost increased by ≥ 10%
• Action: HTTP POST to your pricing API + email merchant for review before auto-updating retail

Workflow 8: Flag high-return-rate variants

• Trigger: Refund created
• Condition: Refund includes personalized variant + refund reason contains "quality"
• Action: Add tag "quality-concern" to product; email QA team

Workflow 9: POD partner sync error alert

• Trigger: Fulfillment created but not fulfilled within 24 hours
• Condition: Line item vendor = "Printful" (or your POD partner)
• Action: Email fulfillment team + Slack alert

Workflow 10: Automatic tier assignment based on order history

• Trigger: Order paid
• Condition: Customer total spend ≥ $500
• Action: Add tag "vip-tier" to customer (unlocks wholesale pricing via customer-tag pricing app)

Setup a workflow (5 minutes)

1. Install Shopify Flow from App Store (free)
2. Apps → Shopify Flow → Create workflow
3. Select trigger from library (Inventory changed, Order created, etc.)
4. Add condition (Variant inventory ≤ 5, Product tag contains "X", etc.)
5. Add action (Send email, Add tag, HTTP webhook, etc.)
6. Turn workflow ON
7. Test by triggering the event (e.g. adjust variant inventory below threshold)

HTTP webhook action for external integrations

HTTP action sends webhook to any URL. Powers integrations Shopify doesn't have native actions for:

• Slack alerts (Slack webhook URL)
• Klaviyo events (Klaviyo API)
• Google Sheets logging (Zapier webhook or Sheets API)
• Custom internal tools (your own API endpoint)
• Discord alerts (Discord webhook)
• Twilio SMS (Twilio API)

Configure headers + JSON body per your target's spec.

Limitations to know

• No loops or branching within one workflow (sequential only). Break complex logic into multiple workflows.
• Actions run in order; no parallel execution
• Some actions Plus-only (email templates, Discount API access)
• Rate limits apply — high-frequency workflows may throttle
• Debugging via run history only (no step-through debugger)

Frequently asked questions

Related setup guides

• Low-Stock Alerts Setup
• Webhook for Variant Changes
• Admin API for Options + Variants