To verify that the API keys are correct, follow the steps given in Connect to Mollie.
Log in to your Mollie Dashboard.
Go to Settings > Website profiles.
Click Payment methods under the website profile.
Use the toggles to activate your payment methods.
A blue toggle indicates that the payment method is active. A yellow toggle indicates that it's pending Mollie's approval.
Some payment methods require Mollie's approval before they're available in your Mollie Dashboard. If your account has been approved but payment methods are still missing from your dashboard, contact support.