curl --request GET \
--url https://api.international.coinbase.com/api/v1/portfolios/{portfolio}/position-limits \
--header 'CB-ACCESS-KEY: <api-key>' \
--header 'CB-ACCESS-PASSPHRASE: <api-key>' \
--header 'CB-ACCESS-SIGN: <api-key>' \
--header 'CB-ACCESS-TIMESTAMP: <api-key>'