I accidentally upgraded my account from affiliate to vendor

Is this a problem? Is it possible to downgrade the account again?

An upgrade to a vendor does not have any negative effect. A vendor account offers all affiliate features as well.

You will not have any limitations as an affiliate with the vendor account. The only difference is the activation of an additional area for the product setup (“Administration”).

If you do not set up products, please do not pay attention to this area. This is why we do not issue downgrades.