Get pending OAuth data

Fetch pending OAuth data for headless mode using the pendingDataToken from the redirect URL.

Scope: This endpoint is used for LinkedIn organizations, Snapchat profiles, and Pinterest boards, where the selection list is too large to fit in URL params. The redirect carries a pendingDataToken instead of the full payload; the response includes the corresponding selection array (e.g. boards for Pinterest). WhatsApp, Facebook, Google Business and other platforms pass selection state directly via URL query params on the redirect (profileId, tempToken, step), no pending record is created, so this endpoint will return 404 for those flows. Use the platform-specific selection endpoint instead (e.g. /v1/connect/whatsapp/select-phone-number).

Token is one-time use and expires after 10 minutes. No authentication required.