Add --country to checkout create for presentment currency localization

`checkout create` now sets `checkout.context.address_country` from the
explicit global `--country` flag, so the merchant resolves presentment
currency to the buyer's country instead of falling back to the agent host's
geo-IP. Verified live: `--country GB` returns GBP (was EUR from a non-UK host)
while the signed-in saved address is preserved (stdin-supplied context wins).

Assisted-By: devx/f92431b1-082a-488b-819b-ad2a77159758

Author: joerj123

.changeset/country-checkout-localization.md

@@ -0,0 +1,5 @@
+---
+'@shopify/shop-cli': patch
+---
+
+Add `--country` to `checkout create`, setting `checkout.context.address_country` so the merchant resolves presentment currency to the buyer's country (stdin context wins; saved address is not overridden).

skill/SKILL.md

@@ -67,8 +67,8 @@ shop catalog get-product gid://shopify/p/abc --select Color=Black --select Size=
 
 ### Checkout
 ```bash
-# create from a variant
-printf '{"email":"buyer@example.com"}' | shop checkout create --shop-domain example.myshopify.com --variant-id 123 --quantity 1 --checkout-stdin
+# create from a variant (--country localizes presentment currency)
+printf '{"email":"buyer@example.com"}' | shop checkout create --shop-domain example.myshopify.com --variant-id 123 --quantity 1 --country GB --checkout-stdin
 # create from an existing cart
 printf '{"cart_id":"cart_123","line_items":[]}' | shop checkout create --shop-domain example.myshopify.com --checkout-stdin
 printf '{"fulfillment":{"methods":[]}}' | shop checkout update --shop-domain example.myshopify.com --checkout-id CHECKOUT_ID --checkout-stdin
@@ -164,6 +164,7 @@ When the item is visual (clothing, shoes, accessories, furniture, decor, art) **
 **Reading the `checkout create` / `update` response:**
 - Inspect `status`, `email`, addresses, `continue_url`, and `payment.instruments`.
 - If the buyer's saved shipping details are missing, collect them and pass via `checkout create`/`update`.
+- Pass `--country <ISO2>` on `checkout create` to localize presentment currency; without it the merchant may present a foreign currency. It does not override the saved address.
 - **Warnings:** display every `messages[]` entry with type `warning` (e.g. `final_sale`, `prop65`, `age_restricted`) before completing. Show `presentation: "disclosure"` warnings verbatim — never omit or summarize them. Never complete a purchase without surfacing these.
 
 Then take one of two paths:

skill/references/direct-api.md

@@ -110,6 +110,7 @@ Create with line items, or pass a checkout body that already contains a `cart_id
       },
       "checkout": {
         "cart_id": "<optional_cart_id>",
+        "context": { "address_country": "US" },
         "line_items": [
           {
             "quantity": 1,
@@ -142,6 +143,8 @@ Create with line items, or pass a checkout body that already contains a `cart_id
 }
 ```
 
+`context.address_country` (ISO2) localizes presentment currency to the buyer's country; without it the merchant infers it from the request geo-IP. It does not override the saved address.
+
 If response status is `ready_for_complete` and includes a Shop Pay payment token, complete after clear purchase intent. If no payment token is present, present the UCP `continue_url` as a Finish in Shop link. **If the buyer has a delegated budget (see Payment Budget) but the checkout still returns no payment instruments, the merchant does not accept Shop Pay** — hand off `continue_url` or suggest another store; do not re-prompt the user to set up a budget (they already have one).
 
 The checkout response may include a `messages[]` array. You MUST display every `warning` message's `content` to the user (e.g. `final_sale`, `prop65`, `age_restricted`) before completing. Show `presentation: "disclosure"` warnings verbatim and do not omit or summarize them away. Never complete a purchase without surfacing these messages.

src/cli.ts

@@ -287,6 +287,7 @@ export function createProgram(deps: CliDependencies = {}): Command {
           quantity: options.quantity,
           checkout,
           buyerIp: options.buyerIp,
+          country: explicitCountry(program),
         })
         return annotateShopPayAvailability(client, result)
       })
@@ -400,18 +401,23 @@ export async function main(argv = process.argv, deps: CliDependencies = {}): Pro
   }
 }
 
+function explicitCountry(program: Command): string | undefined {
+  return program.getOptionValueSource('country') === 'cli'
+    ? program.optsWithGlobals<GlobalOptions>().country
+    : undefined
+}
+
 function resolveClient(deps: CliDependencies, program: Command): ShopCatalogClient {
   const globals = program.optsWithGlobals<GlobalOptions>()
   const store = resolveStore(deps, globals)
   // Only treat --country as an explicit override when it was actually passed on the CLI;
   // otherwise leave it undefined so the client falls back to the stored preference, then
   // DEFAULT_COUNTRY. The default value of the option must never override a stored country.
-  const explicitCountry = program.getOptionValueSource('country') === 'cli' ? globals.country : undefined
   return new ShopCatalogClient({
     fetch: deps.fetch,
     store,
     profileUrl: globals.profileUrl,
-    country: explicitCountry,
+    country: explicitCountry(program),
   })
 }
 

src/shop-client.ts

@@ -99,6 +99,7 @@ export interface CheckoutCreateInput {
   quantity?: number
   checkout?: JsonObject
   buyerIp?: string
+  country?: string
 }
 
 export interface CheckoutUpdateInput {
@@ -186,6 +187,10 @@ export class ShopCatalogClient {
         },
       ]
     }
+    if (input.country) {
+      const piped = isPlainObject(checkout.context) ? checkout.context : {}
+      checkout.context = { address_country: input.country, ...piped }
+    }
 
     return unwrapMcpResult(await this.callShopMcp(shopDomain, 'create_checkout', { checkout }, token, buyerIp))
   }

tests/checkout-orders.test.ts

@@ -66,6 +66,34 @@ describe('checkout and orders', () => {
     })
   })
 
+  it('sets checkout.context.address_country from country, letting stdin context win', async () => {
+    const store = createStore({ [ACCESS_TOKEN_ACCOUNT]: 'access' })
+    const bodies: unknown[] = []
+    const fetchMock = createFetchMock(async (url, init) => {
+      if (url.endsWith('/userinfo')) return jsonResponse({ sub: 'user-1' })
+      if (url === 'https://shop.app/oauth/token') return jsonResponse({ access_token: 'ucp-jwt' })
+      if (url === 'https://api.ipify.org?format=json') return jsonResponse({ ip: '203.0.113.10' })
+      bodies.push(await readJsonBody(init))
+      return jsonResponse({ jsonrpc: '2.0', id: 1, result: { structuredContent: { status: 'ready_for_complete' } } })
+    })
+    const client = new ShopCatalogClient({ fetch: fetchMock, store })
+
+    await client.createCheckout({ shopDomain: 'example.myshopify.com', variantId: '123', country: 'GB' })
+    await client.createCheckout({
+      shopDomain: 'example.myshopify.com',
+      variantId: '123',
+      country: 'GB',
+      checkout: { context: { address_country: 'US' } },
+    })
+
+    expect(bodies[0]).toMatchObject({
+      params: { name: 'create_checkout', arguments: { checkout: { context: { address_country: 'GB' } } } },
+    })
+    expect(bodies[1]).toMatchObject({
+      params: { name: 'create_checkout', arguments: { checkout: { context: { address_country: 'US' } } } },
+    })
+  })
+
   it('unwraps the MCP envelope and returns the checkout payload, not the raw frame', async () => {
     const store = createStore({ [ACCESS_TOKEN_ACCOUNT]: 'access' })
     const checkout = { id: 'gid://shopify/Checkout/abc', status: 'ready_for_complete', currency: 'GBP' }
@@ -464,6 +492,27 @@ describe('checkout and orders', () => {
     expect(names).toEqual(['create_checkout', 'create_checkout', 'update_checkout', 'complete_checkout'])
   })
 
+  it('wires --country into checkout.context.address_country via the CLI', async () => {
+    const { createProgram } = await import('../src/cli.js')
+    const store = createStore({ [ACCESS_TOKEN_ACCOUNT]: 'access' })
+    let body: { params: { name: string; arguments: { checkout: { context?: { address_country?: string } } } } } | undefined
+    const fetchMock = createFetchMock(async (url, init) => {
+      if (url.endsWith('/userinfo')) return jsonResponse({ sub: 'user-1' })
+      if (url === 'https://shop.app/oauth/token') return jsonResponse({ access_token: 'ucp-jwt' })
+      if (url === 'https://api.ipify.org?format=json') return jsonResponse({ ip: '203.0.113.10' })
+      const parsed = (await readJsonBody(init)) as typeof body
+      if (parsed?.params?.name === 'create_checkout') body = parsed
+      return jsonResponse({ jsonrpc: '2.0', id: 1, result: { structuredContent: { status: 'ready_for_complete' } } })
+    })
+    const base = { fetch: fetchMock, store, stdout: { write: fn() }, stderr: { write: fn() }, exit: (() => undefined) as never }
+
+    await createProgram(base).parseAsync([
+      'node', 'shop', 'checkout', 'create', '--shop-domain', 'example.myshopify.com', '--variant-id', '123', '--country', 'GB',
+    ])
+
+    expect(body?.params.arguments.checkout.context).toEqual({ address_country: 'GB' })
+  })
+
   it('surfaces UCP checkout messages (final_sale, prop65) above the raw JSON on create', async () => {
     const { createProgram } = await import('../src/cli.js')
     const stdout = { write: fn() }