You will receive two API keys from Mondu. The Demo API Key will be sent to you in the beginning of the onboarding process, while the Production API Key will be sent out once you are ready to accept live payments.
All requests must be made over HTTPS and will be authenticated over the Api-Token header authentication.
Be Careful
API keys must be kept secret. They should not be in your client-side code or checked into your application's code.