Request to activate a merchant account

Sends a request to activate the merchant account identified in the path. You get the result of the activation asynchronously through a [`merchant.updated`](https://docs.adyen.com/api-explorer/ManagementNotification/latest/post/merchant.updated) webhook. Once the merchant account is activated, you can start using it to accept payments and payouts. Use this endpoint if your integration requires it, such as Adyen for Platforms Manage. Your Adyen contact will set up your access. To make this r...