Request body for PUT /v1/interest/account/{accountId}. The endpoint replaces the full interest configuration of the account, partial updates are not supported. Every request must redeclare a complete configuration that satisfies the rules below.

Interest type. Exactly one of the two paths must be chosen:

• Benchmark-indexed rate: If you pass benchmark and margin_rate., then margin is optional. fixed_interest_rate must be omitted.
• Fixed rate: If you pass fixed_interest_rate, then benchmark, margin_rate, and margin must all be omitted.

Passing neither benchmark nor fixed_interest_rate returns 400 Bad Request with fixed_interest_rate must be provided. Passing both returns 400 Bad Request with fixed_interest_rate is not allowed when benchmark is passed.

Tax-withholding rule: Driven by tax_withholding.withholding_moment:

• When withholding_moment is ACCRUAL, fee_processing_code is required and tax_rules must be omitted.
• When withholding_moment is CAPITALIZATION, tax_rules is required and fee_processing_code must be omitted.
• When tax_withholding is omitted, no withholding is configured.

Tax-exemption rule: When taxes_exemption is true, tax_withholding must be null. When taxes_exemption is false or omitted, tax_withholding follows the rule above.

Numeric fields (fixed_interest_rate, margin_rate) must have a positive value. tax_withholding.fee_processing_code is limited to 128 characters.