def METHOD_NAME(self):
    parameters = {
        **self.serialize_url_param(
            "galleryName", self.ctx.args.gallery_name,
            required=True,
        ),
        **self.serialize_url_param(
            "resourceGroupName", self.ctx.args.resource_group,
            required=True,
        ),
        **self.serialize_url_param(
            "subscriptionId", self.ctx.subscription_id,
            required=True,
        ),
    }
    return parameters