I hear a lot about BlueSnap as a potential Payment Gateway for merchants like me, does anyone know what kind of account integrations the offer?
You can see the integration options in this page, the main questions you should ask yourself are whether you'll need to work with a product catlog or not - and whether you have the resources to develop with the API solutions.
If you're already using shopping carts, you can integrate Magento, PrestaShop or WooCommerce with BlueSnap.