Retrieve the selected payer Account's effective settings through the calling Account's authorized relationship with the specified Payer. A V3-created child can inherit payableDefaults, defaultPaymentMethod and default or currency-specific payroll funding sources through its parent link's payerSettings mode; payoutDelay, instantPayoutEligible, defaultAccountCurrency, other payroll settings and employerPayrollSettings remain local. Payable terms resolve engagement, relationship, then effective payer Account defaults; payee-issued Invoice terms remain payee-controlled. Auto-pay for both document types resolves engagement, relationship, then effective payer Account defaults; otherwise auto-pay is off. Explicit own values remain unchanged. This endpoint reads settings; a payee cannot write the linked payer Account's global settings.