Magento can easily allow to publish/unpublish a payment method from the frontend. Usually payments extension have a simple Yes/No configuration option for this purpose. But this does not exist, almost never, to have same configuration option in admin.

Why do that ?

It can be used when you renew, or edit an order. At this time you will have a list a payment option you can choose from. Some aren't accured and need to be disabled, some are not visible and need be enabled, so you can select them.

This is a simple and quick method to move magento from an host to another. It would be prefereable to have enough skills in mysql and in linux command line to do that properly. Also direct acces in console to your both host can be helpfull but it's not required.

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