diff --git a/MODELS.md b/MODELS.md
index fc388ac..45d3957 100644
--- a/MODELS.md
+++ b/MODELS.md
@@ -445,12 +445,12 @@ struct Sku {
     item: PurchaseItemType,
     variant: Option<String>,
     description: Option<String>,
-    price: Option<rusty_money::Money>,
+    price: rusty_money::Money,
     requires_shipping: bool,
     shipping_charge: Option<rusty_money::Money>,
 }
-struct PurchaseItem {
-    id: PurchaseItemId,
+struct LineItem {
+    id: LineItemId,
     sku: SkuId,
     quantity: usize,
 }
@@ -465,7 +465,7 @@ enum PurchaseState {
 }
 struct Purchase {
     id: String,
-    items: Vec<PurchaseItem>,
+    items: Vec<LineItem>,
     state: PurchaseState,
     purchased_by: Person,
     purchased_at: Option<chrono::DateTime>,
diff --git a/SCHEMA.md b/SCHEMA.md
index 3624716..96c4ac8 100644
--- a/SCHEMA.md
+++ b/SCHEMA.md
@@ -817,3 +817,96 @@ CREATE TABLE CollectionOtherProducts (
 CREATE INDEX CollectionOtherProducts_collection_id_IDX ON CollectionOtherProducts (collection_id);
 CREATE INDEX CollectionOtherProducts_other_product_id_IDX ON CollectionOtherProducts (other_product_id);
 ```
+
+# Skus
+The Skus table will contain SKUs () representing items available for Purchase through the server.
+
+``` sql
+CREATE TABLE Skus (
+	id TEXT(36),
+	item_type TEXT,
+	item_id TEXT(36),
+	variant TEXT,
+	description TEXT,
+	price NUMERIC DEFAULT (0.00),
+	requires_shipping INTEGER DEFAULT (0),
+	shipping_charge NUMERIC DEFAULT (0.00),
+	CONSTRAINT Skus_PK PRIMARY KEY (id)
+);
+CREATE INDEX Skus_item_type_IDX ON Skus (item_type);
+CREATE INDEX Skus_item_id_IDX ON Skus (item_id);
+CREATE INDEX Skus_variant_IDX ON Skus (variant);
+CREATE INDEX Skus_description_IDX ON Skus (description);
+CREATE INDEX Skus_price_IDX ON Skus (price);
+CREATE INDEX Skus_requires_shipping_IDX ON Skus (requires_shipping);
+CREATE INDEX Skus_shipping_charge_IDX ON Skus (shipping_charge);
+```
+
+# LineItems
+The LineItems table will contain individual SKUs and their associated quantites as part of a Purchase.
+
+``` sql
+CREATE TABLE LineItems (
+	id TEXT(36),
+	sku_id TEXT(36),
+	quantity INTEGER DEFAULT (1),
+	CONSTRAINT LineItems_PK PRIMARY KEY (id),
+	CONSTRAINT LineItems_FK FOREIGN KEY (sku_id) REFERENCES Skus(id)
+);
+CREATE INDEX LineItems_sku_id_IDX ON LineItems (sku_id);
+CREATE INDEX LineItems_quantity_IDX ON LineItems (quantity);
+```
+
+# CouponCodes
+The CouponCodes table will contain coupon codes that can be redeemed for a discount, either by amount or percentage, on a Purchase.
+
+``` sql
+CREATE TABLE CouponCodes (
+	id TEXT(36),
+	name TEXT,
+	code TEXT,
+	uses INTEGER DEFAULT (0),
+	max_uses INTEGER DEFAULT (0),
+	expiration INTEGER,
+	discount_flat NUMERIC DEFAULT (0.00),
+	discount_percentage NUMERIC DEFAULT (0.00),
+	is_sku_specific INTEGER DEFAULT (0),
+	is_active INTEGER DEFAULT (0),
+	created_by TEXT(36),
+	created_at INTEGER,
+	modified_by TEXT(36),
+	modified_at INTEGER,
+	deleted_by TEXT(36),
+	deleted_at INTEGER,
+	CONSTRAINT CouponCodes_PK PRIMARY KEY (id),
+	CONSTRAINT CouponCodes_FK FOREIGN KEY (created_by) REFERENCES Persons(id),
+	CONSTRAINT CouponCodes_FK_1 FOREIGN KEY (modified_by) REFERENCES Persons(id),
+	CONSTRAINT CouponCodes_FK_2 FOREIGN KEY (deleted_by) REFERENCES Persons(id)
+);
+CREATE INDEX CouponCodes_name_IDX ON CouponCodes (name);
+CREATE UNIQUE INDEX CouponCodes_code_IDX ON CouponCodes (code);
+CREATE INDEX CouponCodes_uses_IDX ON CouponCodes (uses);
+CREATE INDEX CouponCodes_max_uses_IDX ON CouponCodes (max_uses);
+CREATE INDEX CouponCodes_expiration_IDX ON CouponCodes (expiration);
+CREATE INDEX CouponCodes_is_sku_specific_IDX ON CouponCodes (is_sku_specific);
+CREATE INDEX CouponCodes_is_active_IDX ON CouponCodes (is_active);
+CREATE INDEX CouponCodes_created_by_IDX ON CouponCodes (created_by);
+CREATE INDEX CouponCodes_created_at_IDX ON CouponCodes (created_at);
+CREATE INDEX CouponCodes_modified_by_IDX ON CouponCodes (modified_by);
+CREATE INDEX CouponCodes_modified_at_IDX ON CouponCodes (modified_at);
+CREATE INDEX CouponCodes_deleted_by_IDX ON CouponCodes (deleted_by);
+CREATE INDEX CouponCodes_deleted_at_IDX ON CouponCodes (deleted_at);
+```
+
+# CouponCodeSkus
+The CouponCodeSkus table will relate a CouponCode to one or more Skus the CouponCode can be applied to, if CouponCode.is_sku_specific is true. (If CouponCode.is_sku_specific is false the CouponCode can be applied to an entire Purchase regardless of the Skus being purchased.)
+
+``` sql
+CREATE TABLE CouponCodeSkus (
+	coupon_code_id TEXT(36),
+	sku_id TEXT(36),
+	CONSTRAINT CouponCodeSkus_PK PRIMARY KEY (coupon_code_id,sku_id),
+	CONSTRAINT CouponCodeSkus_FK FOREIGN KEY (coupon_code_id) REFERENCES CouponCodes(id),
+	CONSTRAINT CouponCodeSkus_FK_1 FOREIGN KEY (sku_id) REFERENCES Skus(id)
+);
+```
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