Product variant triggers, step by step

Shopify reports a changed variant as "the product was updated". These four triggers look inside: they fire once per variant whose price, SKU, barcode or unit price changed, with the value before and after. Price and unit price also carry delta, percentChange and direction, because a Flow condition cannot do arithmetic and money arrives as text.

On this page: Product Variant Price Changed, Product Variant SKU Changed, Product Variant Barcode Changed, Product Variant Unit Price Changed

Product Variant Price Changed

Fires once per variant whose price or compare-at price changed. A product with five variants that all get a new price fires five times.

Fires from	Shopify webhook plus change detection
Permission	Product, Variant & Collection Data Access
Switched on	Turning on a Flow workflow that uses it switches it on. Its own switch is on the app's Triggers page

Use it for

• Alert merchandising about markdowns above a threshold.
• Keep bundle, B2B or marketplace prices in step with the component price.
• Catch pricing mistakes: a price that fell by more than half is rarely intended.

What Product Variant Price Changed sends to your workflow

Variable in Flow	Type	What it holds
productVariant	Object	The product variant with updated price
productVariant.id	ID	Global ID of the product variant
productVariant.title	Text	The title of the variant
productVariant.sku	Text	The SKU of the variant
productVariant.barcode	Text	The barcode (EAN) of the variant
productVariant.price	Money (amount, currencyCode)	The current price of the variant
productVariant.compareAtPrice	Money (amount, currencyCode)	The compare-at price of the variant
productVariant.product	Object	The product this variant belongs to
productVariant.product.id	ID	Global ID of the product
productVariant.product.title	Text	The title of the product
productVariant.product.handle	Text	The handle of the product
priceChange	Object	The price change details (old and new values)
priceChange.oldPrice	Money (amount, currencyCode)	The previous price
priceChange.newPrice	Money (amount, currencyCode)	The new price
priceChange.oldCompareAtPrice	Money (amount, currencyCode)	The previous compare-at price
priceChange.newCompareAtPrice	Money (amount, currencyCode)	The new compare-at price
priceChange.delta	Number	New value minus old value. Null when either side is unknown
priceChange.percentChange	Number	Change as a percentage of the old value (-12.5 = dropped by 12.5 percent). Null when the old value is 0 or unknown
priceChange.direction	Text	increase, decrease or unchanged
eventId	Text	The id of this event. Search for it in the app's Event History to see exactly what was sent.

Example: Alert on markdowns of more than 10 percent

1. Pick Product Variant Price Changed as the trigger.
2. Add a Condition: priceChange.percentChange Less than -10.
3. Add Send internal email: {{productVariant.product.title}} / {{productVariant.title}}: {{priceChange.oldPrice.amount}} -> {{priceChange.newPrice.amount}} {{priceChange.newPrice.currencyCode}} ({{priceChange.percentChange}}%).
4. Turn the workflow on and change a test variant's price.

Product Variant SKU Changed

Fires once per variant whose SKU changed.

Fires from	Shopify webhook plus change detection
Permission	Product, Variant & Collection Data Access
Switched on	Turning on a Flow workflow that uses it switches it on. Its own switch is on the app's Triggers page

Use it for

• Tell the warehouse or ERP that a SKU was renamed before the next order arrives with the new one.
• Block accidental SKU edits on live products.

What Product Variant SKU Changed sends to your workflow

Variable in Flow	Type	What it holds
productVariant	Object	The product variant with updated SKU
productVariant.id	ID	Global ID of the product variant
productVariant.title	Text	The title of the variant
productVariant.sku	Text	The SKU of the variant
productVariant.barcode	Text	The barcode of the variant
productVariant.price	Money (amount, currencyCode)	The current price of the variant
productVariant.product	Object	The product this variant belongs to
productVariant.product.id	ID	Global ID of the product
productVariant.product.title	Text	The title of the product
productVariant.product.handle	Text	The handle of the product
skuChange	Object	The SKU change details (old and new values)
skuChange.oldSku	Text	The previous SKU
skuChange.newSku	Text	The new SKU
eventId	Text	The id of this event. Search for it in the app's Event History to see exactly what was sent.

Example: Send old and new SKU to the warehouse system

1. Pick Product Variant SKU Changed as the trigger.
2. Add Send HTTP request to your ERP or WMS endpoint with a JSON body containing {{skuChange.oldSku}}, {{skuChange.newSku}} and {{productVariant.id}}.
3. Add a Condition in front if blank SKUs should be ignored: skuChange.oldSku Not empty and exists.
4. Turn the workflow on.

Product Variant Barcode Changed

Fires once per variant whose barcode (EAN, UPC, ISBN) changed.

Fires from	Shopify webhook plus change detection
Permission	Product, Variant & Collection Data Access
Switched on	Turning on a Flow workflow that uses it switches it on. Its own switch is on the app's Triggers page

Use it for

• Re-submit a product to a marketplace or Google Merchant Center that matches on GTIN.
• Reprint shelf labels for retail locations.

What Product Variant Barcode Changed sends to your workflow

Variable in Flow	Type	What it holds
productVariant	Object	The product variant with updated barcode
productVariant.id	ID	Global ID of the product variant
productVariant.title	Text	The title of the variant
productVariant.sku	Text	The SKU of the variant
productVariant.barcode	Text	The barcode (EAN) of the variant
productVariant.price	Money (amount, currencyCode)	The current price of the variant
productVariant.product	Object	The product this variant belongs to
productVariant.product.id	ID	Global ID of the product
productVariant.product.title	Text	The title of the product
productVariant.product.handle	Text	The handle of the product
barcodeChange	Object	The barcode change details (old and new values)
barcodeChange.oldBarcode	Text	The previous barcode
barcodeChange.newBarcode	Text	The new barcode
eventId	Text	The id of this event. Search for it in the app's Event History to see exactly what was sent.

Example: Ask retail to reprint a label

1. Pick Product Variant Barcode Changed as the trigger.
2. Add Send internal email to the store team: {{productVariant.product.title}} / {{productVariant.title}}: barcode {{barcodeChange.oldBarcode}} is now {{barcodeChange.newBarcode}}.
3. Turn the workflow on.

Product Variant Unit Price Changed

Fires once per variant whose unit price changed, the "price per 100 g" that some countries require next to the price.

Fires from	Shopify webhook plus change detection
Permission	Product, Variant & Collection Data Access
Switched on	Turning on a Flow workflow that uses it switches it on. Its own switch is on the app's Triggers page

Use it for

• Re-check legally required unit prices after a price or a pack size change.
• Update printed price tags that show the unit price.

What Product Variant Unit Price Changed sends to your workflow

Variable in Flow	Type	What it holds
productVariant	Object	The product variant with updated unit price
productVariant.id	ID	Global ID of the product variant
productVariant.title	Text	The title of the variant
productVariant.sku	Text	The SKU of the variant
productVariant.barcode	Text	The barcode (EAN) of the variant
productVariant.price	Money (amount, currencyCode)	The current price of the variant
productVariant.unitPrice	Money (amount, currencyCode)	The current unit price of the variant
productVariant.product	Object	The product this variant belongs to
productVariant.product.id	ID	Global ID of the product
productVariant.product.title	Text	The title of the product
productVariant.product.handle	Text	The handle of the product
unitPriceChange	Object	The unit price change details (old and new values)
unitPriceChange.oldUnitPrice	Money (amount, currencyCode)	The previous unit price
unitPriceChange.newUnitPrice	Money (amount, currencyCode)	The new unit price
unitPriceChange.delta	Number	New value minus old value. Null when either side is unknown
unitPriceChange.percentChange	Number	Change as a percentage of the old value (-12.5 = dropped by 12.5 percent). Null when the old value is 0 or unknown
unitPriceChange.direction	Text	increase, decrease or unchanged
eventId	Text	The id of this event. Search for it in the app's Event History to see exactly what was sent.

Example: Review unit prices that rose

1. Pick Product Variant Unit Price Changed as the trigger.
2. Add a Condition: unitPriceChange.direction Equal to increase.
3. Add Send internal email with {{unitPriceChange.oldUnitPrice.amount}} and {{unitPriceChange.newUnitPrice.amount}}.
4. Turn the workflow on.

Next steps

• Complete trigger reference - every trigger on one page.
• Choosing the right trigger - which one fits your case.
• Custom triggers - when no built-in trigger fits, write your own.
• Event history and troubleshooting - see what fired and what it carried.
• Trigger events on a record's admin page - the latest events of one record, on its own page in the Shopify admin.