diff --git a/src/Product.ts b/src/Product.ts
index 5df6370..da1cbd5 100644
--- a/src/Product.ts
+++ b/src/Product.ts
@@ -22,6 +22,7 @@ export class Product {
   style: string[] = []
   tags: string = ""
   category: string = ""
+  ebay_category_id: string = ""
   product_type: string = ""
   description: string = ""
   sku: string = ""
@@ -118,6 +119,10 @@ export class Product {
     return vlookupByColumns("values", "product_type", this.product_type, "shopify_category")
   }
 
+  EbayCategory(): string {
+    return vlookupByColumns("values", "product_type", this.product_type, "ebay_category_id")
+  }
+
   ToShopifyProductSet() {
     let sps = new ShopifyProductSetInput()
     if (this.shopify_id != "") {
@@ -196,6 +201,64 @@ export class Product {
     }
     // update dimension metafields
     this.UpdateDimensionMetafields(shop)
+    this.UpdateEbayCategoryMetafield(shop)
+  }
+
+  UpdateEbayCategoryMetafield(shop: Shop) {
+    console.log("UpdateEbayCategoryMetafield()")
+    if (!this.shopify_id) {
+      console.log("Cannot update metafields without a Shopify Product ID.")
+      return
+    }
+    if (this.product_type == "") {
+      console.log("No product type has been set. Skipping.")
+      return
+    }
+    this.ebay_category_id = this.EbayCategory()
+    if (this.ebay_category_id == "") {
+      console.log(`No eBay category defined for '${this.category}'`)
+      return
+    }
+
+    const metafieldsToSet: shopify.MetafieldsSetInput[] = []
+    metafieldsToSet.push({
+      key: "ebay_category_id",
+      namespace: "custom",
+      ownerId: this.shopify_id,
+      type: "single_line_text_field",
+      value: this.ebay_category_id.toString(),
+    })
+
+    const query = /* GraphQL */ `
+      mutation metafieldsSet($metafields: [MetafieldsSetInput!]!) {
+        metafieldsSet(metafields: $metafields) {
+          metafields {
+            id
+            key
+            namespace
+            value
+          }
+          userErrors {
+            field
+            message
+            code
+          }
+        }
+      }
+    `
+
+    const variables = {
+      metafields: metafieldsToSet,
+    }
+
+    const json = `{
+      "query": ${formatGqlForJSON(String(query))},
+      "variables": ${JSON.stringify(variables)}
+    }`
+
+    console.log("Setting ebay_category_id metafield with query:\n" + json)
+    const response = shop.shopifyGraphQLAPI(JSON.parse(json))
+    console.log("metafieldsSet response: " + JSON.stringify(response, null, 2))
   }
 
   // TODO: Make this a Product class method?