Creates a settlement account for the organization. A settlement account is the destination where settled funds are paid out.

Use the currencyType field to select the type of account to create:

• currencyType: fiat — creates a fiat settlement account. Requires currency, paymentType, and paymentCode. The fields to pass inside accountDetails depend on the selected payment method: call GET /v3/config/payment-methods?direction=withdraw&userType=business&currency=<currency> and pass every field listed under the payment method's additionalDetails inside accountDetails.
• currencyType: crypto — creates a crypto settlement account. Requires walletAddress plus the currency identification: either cryptoTicker, or both cryptoCurrency and cryptoNetwork.

The first settlement account created for a given type is marked as the default. If a matching settlement account already exists, the existing account is returned instead of creating a duplicate.