Hi @lukaszs45590312, With respect to ACS, currently there is no
substitution address you can give to test the delivery content, when you
have level of personalization generated from custom resources.
Workaround is you can have mock profiles and also you will have to
differentiate mock vs real profile. Then populate sample data using the
mock profile and try to segment the mock profile as one-off email
delivery to test content before you send to target audience. Incase, if
you're having different...