While using Adyen Gateway for payment method creation if getting below error, it means Insufficient permission to process request.
So the issue lies with the permissions of the Adyen account that you are using to try and process the request, please check the Adyen Account setting and verify the permissions.
Transaction Declined, ResponseCode: 403
Supported document(Adyen response code docuement): https://docs.adyen.com/developers/api-manual
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