Amazon FBA (Fulfilment by Amazon) means sellers store their products in Amazon fulfilment centres and the products are shipped from those fulfilment centres. You can sell from other sales channels via FBA.
When an order comes in as fulfilled by Amazon, the stock level for that FBA location will fall automatically.
When you receive stock in your Amazon warehouse you will need to update your stock levels by creating a Purchase Order or a stock transfer from your primary location.
For Both MFN (Merchant Fulfilled) and FBA, TradeGecko pulls pending Orders from Amazon. These Orders come in as Active. Prices for Pending Orders will be incorrect. You can either manually edit the prices for these orders or, once the credit card details tied to the order have been confirmed, the order will automatically progress to Finalized and the Prices will automatically be updated.