First, you will need a regular Mollie account. You can create it in the usual way.
Go to the Developers tab in your Dashboard and select Apps from the menu at the top.
Before you can start creating apps, you need to sign the developers contract. Select "View developers contract" and agree to the terms.
Once you agreed to the terms you'll need to fill out your application's name and description. Enter this information in the form and click on "Save".
Now you can start creating an App by clicking on "Create application". You will immediately receive the Client ID and the Client Secret. You can use this information to link your App to the API.
Please contact us if you want to let other Mollie customers use your app as well.