What do the ad connectors actually pull?

Daily spend per account and campaign, from the billing side of each platform. Nothing else: no attributed revenue, no conversion counts, no audience data. That is deliberate, because a platform's attributed revenue overlaps with every other platform's and cannot be added up.

It means the marketing line on your statement is what actually left your account on each day, and the efficiency ratios above it are computed against your own revenue rather than against anyone's claim about it.