Lightspeed offers a Gift Card Lookup tool that can be used to find the Lightspeed Serial Number of gift cards sold on Shopify. This tool can be found by navigating in Lightspeed to Customers > Gift Cards.
From that screen you can search by Customer Name, Email, or Lightspeed Serial Number.
In cases where your customer has multiple gift cards you can open the Gift Card Code in Lightspeed to see the last four of the Shopify Serial Number located in the Notes. If your customer has the email they received with the Serial Number from Shopify you can use that to verify.
In the case your customer doesn't have their email available you can check Shopify's Gift Card Lookup by navigating in Shopify to Products > Gift Cards. From the Shopify lookup you can search by Customer Name, or last four of the Shopify Serial Number. You can use this to help verify you're going to redeem the correct gift card in Lightspeed.
If you have any questions about locating the correct Gift Card Serial Number, such as cases where a customer name is not associated to the gift card, please contact our Support team for assistance.