curl --request POST \
--url https://api.exchange.coinbase.com/users/{user_id}/settlement-preferences \
--header 'Content-Type: application/json' \
--header 'cb-access-key: <api-key>' \
--header 'cb-access-passphrase: <api-key>' \
--header 'cb-access-sign: <api-key>' \
--header 'cb-access-timestamp: <api-key>' \
--data '{
"settlement_preference": "<string>",
"user_id": "self"
}'