Email Source: First Data, now part of Fiserv

Homepage: https://www.fiserv.com/en/lp/fdcmerger.html

DMARC Capabilities

Capable of generating DMARC compliant email for others

Yes

Our data indicates First Data is DMARC capable via both SPF and DKIM.

Capable of signing email with DKIM for others

Yes

Contact Fiserv for DKIM setup.

Capable of sending SPF compliant email for others

Yes

Add 'include:gateways.firstdata.com' to your SPF record. You could also contact Fiserv to understand if there's an SPF addition with less authorizations you could use.