BigCommerce setup
BigCommerce uses an API account model — similar to WooCommerce's REST keys but generated inside the BigCommerce admin.
Create an API account
In BigCommerce admin, go to Settings → API → API accounts → Create. Choose "V2/V3 API token", name it "Meridia", and grant these OAuth scopes: Orders (read-only), Products (read-only), Customers (read-only), Information & Settings (read-only), Store Inventory (read-only).
Copy credentials
You'll see the Client ID, Access token, and API path. Paste all three into Meridia's BigCommerce connect screen. The store hash is the subdomain-like string in the API path (e.g. stores/abc1defgh/v3).
Webhooks
Meridia subscribes to store/order/created, store/order/updated, store/order/statusUpdated, and store/refund/created. These drive real-time sync; the hourly poll acts as a safety net.
Multi-channel on BigCommerce
If you use BigCommerce's Channel Manager to push to Amazon or eBay, connect those platforms directly in Meridia as well — Meridia's attribution works better when talking to each marketplace as a first-class source.