mode
The mode that Amazon Pinpoint uses to invoke the AWS Lambda function. Possible values are:
FILTER - Invoke the function to customize the segment that's used by a campaign.
DELIVERY - (Deprecated) Previously, invoked the function to send a campaign through a custom channel. This functionality is not supported anymore. To send a campaign through a custom channel, use the CustomDeliveryConfiguration and CampaignCustomMessage objects of the campaign.