I have to do an integration with a SOAP service with BinarySecurityToken using an X509 digital certificate, has anyone ever done that? What type of authentication do I have to put in the creation of a connected service?
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Is that a SOAP question? The OOTB SOAP support is pretty limited in Appian.
If the authentication is only done using that token, I suggest to set authentication to none, and then create and include the token as a header in the integration object.