What is an API key?

An API (Application programming interface) is a type of software interface that connects 2 programs with each other and transfers data. In our case, the Mollie API connects your webshop or integration with the Mollie Platform. The Mollie Platform connects to payment methods, such as Klarna. When your customer pays via this payment method, you can see this on your Mollie Dashboard.

An API key is a unique code for the API between your Mollie account and another website. With this key, the API recognizes the user and knows that he’s dealing with you instead of someone else. You can enter a Test API key or Live API key when you’re connecting Mollie to a third party. 


Test and Live API keys

You can use 2 different kinds of API keys: a Test API key and a Live API key:

  • Test API key: With this API key, you can test the connection between a website and Mollie. You can test transactions without paying a fee to us.
  • Live API key: You can use this API key to process real transactions. After using this key to connect the two websites, your customers can make payments.


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