We are going to give you the exact details to manage your subscription. Everything happens from the plan page, so you can already jump there.

In order upgrade your plan, your Organization (company) must be attached to a country. So if you are from Germany, you can select Germany from the Organization screen. That lets Feedier apply the correct tax rate and send you invoices that will make your accountant happy. This is not required for the Essentials plan. 

You can select your plan from here: 

It can be used to upgrade or downgrade your plan, at anytime. The amount billed will be calculated based on your current billing period. 

Then you can set your Credit Card, we use Stripe as payment platform so we do not save any sensitive data on the Feedier server.

Once updated, you will receive a notification with the billed amount and new plan details. All set :)