curl --request POST \
--url https://api.exchange.coinbase.com/margin/usdc \
--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 '{
"enabled": true
}'