Pixel plus Conversions API
Without the connection "you're flying blind."
Events Manager > Connect data offers web, app, offline (calls, in-store), CRM (lead campaigns) and messaging. Partner integrations - Shopify, WooCommerce, Google Tag Manager - install the pixel for you. Because "browsers now block a lot of tracking and people use ad blockers", the Conversions API sends the same events server to server and Meta removes duplicates. Not needed on day one, but pixel plus CAPI "give you the most complete picture" once real money is spent. Each ad's tracking section then feeds those events back: the objective decides what Meta optimises for, tracking feeds it real data.
Sales and lead campaigns optimise on what tracking reports - no tracking, no learning.