You can use the Shopify GraphQL Admin API to update the available quantity for multiple products at once by using a bulk mutation. Here's an example mutation that you can modify to suit your needs:
mutation {
productBulkUpdate(
productBulkInput: [
{ id: "gid://shopify/Product/1", variants: { inventoryQuantities: [{ locationId: "gid://shopify/Location/1", availableQuantity: 100 }] } },
{ id: "gid://shopify/Product/2", variants: { inventoryQuantities: [{ locationId: "gid://shopify/Location/1", availableQuantity: 200 }] } },
{ id: "gid://shopify/Product/3", variants: { inventoryQuantities: [{ locationId: "gid://shopify/Location/1", availableQuantity: 300 }] } }
# add more products here
]
) {
bulkOperation {
id
status
url
}
userErrors {
field
message
}
}
}
In this example, we're using the productBulkUpdate mutation to update the available quantity for three products by setting their inventoryQuantities. You can add more products to the productBulkInput array by following the same format.
Note that you will need to replace the product IDs (gid://shopify/Product/1, gid://shopify/Product/2, etc.) with the actual IDs of your products, and the location ID (gid://shopify/Location/1) with the ID of the location where you want to update the inventory.
Once you have the mutation ready, you can execute it using the Shopify GraphQL Admin API.
The API will return a bulkOperation object that includes the ID, status, and URL of the bulk operation. You can use the URL to check the status of the operation and retrieve the results.
