The base currency for your account is automatically detected through the API based on the currency of your store. When you have connected accounts using different currencies, the default currency is determined by the first platform connected.

All sections of Inventory Planner (aside from purchase orders) display figures in your base currency. Cost prices shown in Replenishment and other reports for your variants are converted into the base currency.

Purchase orders can be created in the currency assigned to a specific supplier. You can designate a currency for your supplier under Catalog > Vendors.

To set the currency for a single vendor, go to Catalog > Vendors and click "Settings" beneath the vendor you're editing.

In the "Settings" tab, scroll to the "Payment and shipment" section, where you can set the "Currency" field.

Select a currency from the dropdown options, and once you've chosen your currency, click "Save" at the bottom of the screen.

Vendor currency can be updated for several suppliers at one time using bulk actions. In Catalog > Vendors, use the checkboxes on the left to select which suppliers to update. Then click "Bulk Actions" at the bottom of the screen, then "Set currency".

In the popup, choose the currency you're assigning your suppliers, then click "Apply" to save changes.

You can also change the currency when creating a purchase order. In edit mode of your purchase order, click on "Settings" and scroll to the "Currency" field.

Inventory Planner connects to Fixer.io to retrieve up-to-the-minute currency conversion rates. Data is retrieved from banks and financial data providers, and the exchange rate information used is the midpoint of the Bid and Ask.

If you'd like to see exchange rates for a historic date, you will need to query Fixer.io's API. Please see the "Historical rates endpoint" section in their documentation for more information.