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# Marketplaces > Amazon > FBA > Parameters

Use this tab to configure Fulfillment by Amazon (FBA) settings, including stock synchronization rules, fee surcharges, pricing formulas, shipping templates, and Multi-Channel Fulfillment options.

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### Fulfillment by Amazon

* **FBA MASTER PLATFORM:** Select to designate this marketplace profile as the master FBA platform for Amazon Europe.

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### Configuration Settings

* **BEHAVIOR:** Define stock handling and fulfillment switching:
1. **Use Amazon FBA stock first, then switch to your own stock (AFN/MFN auto switching):** Automatically transitions fulfillment methods to seller-fulfilled once FBA inventory is exhausted.
2. **Synchronize stocks from Amazon FBA, your shop's stock is overrode:** Replaces local shop inventory quantities with live Amazon FBA stock levels.

* **FBA SURCHARGE:** Apply percentage-based surcharges to FBA items:
1. **Estimated fees:** Applies a surcharge calculated as a percentage of estimated Amazon fees.
2. **Fulfillment fees:** Applies a surcharge calculated as a percentage of Amazon fulfillment fees.

* **FBA DEFAULT SURCHARGE:** Enter a fallback fee surcharge amount to use when estimated fees are not yet available from Amazon.
* **FBA PRICE FORMULA:** Set a specific percentage adjustment formula specifically for FBA product listings.
* **DEFAULT SHIPPING TEMPLATE:** Select the shipping template to assign to FBA products. If unselected, the profile's default shipping group is used.
* **MULTI-CHANNEL FBA:** Toggle **YES/NO** to enable Amazon Multi-Channel Fulfillment (MCF) for non-Amazon orders.
* **AUTOMATIC MULTI-CHANNEL:** Toggle **YES/NO** to automatically dispatch eligible orders through FBA Multi-Channel Fulfillment upon order creation.
* **DECREASE STOCK:** Toggle **YES/NO** to automatically deduct local stock when importing orders.