feat: discount vendor credit

packages/server/src/models/VendorCredit.ts

@@ -58,6 +58,24 @@ export default class VendorCredit extends mixin(TenantModel, [
     return this.subtotal * this.exchangeRate;
   }
 
+  /**
+   * Discount amount.
+   * @returns {number}
+   */
+  get discountAmount() {
+    return this.discountType === DiscountType.Amount
+      ? this.discount
+      : this.subtotal * (this.discount / 100);
+  }
+
+  /**
+   * Discount percentage.
+   * @returns {number | null}
+   */
+  get discountPercentage(): number | null {
+    return this.discountType === DiscountType.Percentage ? this.discount : null;
+  }
+
   /**
    * Vendor credit total.
    * @returns {number}