Create Meta Pixel

Creates a Meta pixel in an ad account (act_<id>/adspixels with the pixel name). If the ad account already has a pixel, Meta refuses another one (error 6200 "A pixel already exists for this account" or 6202 "More than one pixel exist for this account"): nothing is created, no credits are used, and the existing pixels are returned as list_meta_pixels lists them. The pixel is created on the ad account; Meta's API reference offers no pixel creation at Business Manager level.

The result carries the new pixel_id and, when Meta returns it, the pixel base code (`code`). That code is then installed on every page of the site, for example as a Tag Manager Custom HTML tag or through the site's own Meta integration. Custom conversions on the pixel are created with create_meta_custom_conversion and server-side conversions are sent with send_meta_conversion_event (Conversions API). confirm=false previews, confirm=true creates.