Connector name: Microsoft Dynamics 365 Business Central  

Table name: G/L Budget Entry (and likely G/L Budget Name)

API documentation link: Microsoft publishes standard API pages for both, but they live in a different API group. Both are part of Microsoft's "Reports as APIs for Finance" feature, exposed under the reportsFinance/beta API group (Advanced APIs), which Microsoft made generally available in October 2022 (BC 2022 wave 2).

 generalLedgerBudgets — built on the G/L Budget Name table (table 95), returns budget header/name info.
generalBudgetEntries — the actual budget entry/amount records (account, period, dimensions, amount).

Additional details: