curl --location 'https://api.treli.co/v1/portal/sessions' \
--header 'Authorization: Basic <encoded-value>' \
--header 'Content-Type: application/json' \
--data '{
"customer": "cus_LSPQ6kM4AxxxxxAp3fycoHTW"
}'{
"id": "string",
"expires_at": "2019-08-24T14:15:22.123Z",
"created_date": "2019-08-24T14:15:22.123Z",
"is_test": true,
"customer": "string",
"url": "string"
}