We are in the process of accepting payments through Forms using the Braintree payment gateway. We have set up an account with Braintree and recently completed the PCI questionnaire. When I went to Braintree, I retrieved our sandbox merchant id, and public & private keys. On the forms configuration page, I have input these values into the payment gateway tab. In my test form, I have gone into the properties of the message start event of the business process, checked the collect payment box and pointed the total amount field to the forms' currency field. When I try to run the form I get the error
An error occurred while authenticating merchant information, please double check your payment configuration. [LFF9408-PaymentAuthenticationError]
Have I missed something in the setup? Any assistance will be appreciated.