SPF
To authorize Tapfiliate to send emails on your behalf you will have to include it in your SPF record. The SPF record mechanism used for Tapfiliate is shown below.
include:spf.tapfiliate.com
DKIM
Tapfiliate do not seem to have support for DKIM at the moment but please reach out to them for more information.
Create a free OnDMARC account to test your configuration.