NPSP auto-detection

Automatically detect whether your connected Salesforce org has the Nonprofit Success Pack (NPSP) installed and configure field mappings accordingly — no manual setup, no "is this NPSP or vanilla Salesforce?" question. Detection runs at connect time and re-runs whenever your Salesforce admin makes changes. Critical for nonprofits where the executive director sets up the integration but the Salesforce admin actually installed NPSP — we figure it out either way.