public LinkExistingUserToExternalProviderPreCommand(IProvideUserConfiguration configuration, IOAuthUserService service, IOAuthUserValidatorResolver validatorResolver)
 {
     this.configuration = configuration;
     this.service = service;
     this.validatorResolver = validatorResolver;
 }
 public RegisterExternalUserPreCommand(IProvideUserConfiguration configuration, IOAuthUserValidatorResolver validatorResolver)
 {
     this.configuration = configuration;
     this.validatorResolver = validatorResolver;
 }