We've improved our BigCommerce integration by taking advantage of their new server to server checkout API. Using this new API will ensure all options configured in the customer's cart will be will be correctly saved with the associated BigCommerce order. The previous BigCommerce integration had occasional issues with products having multiple configurable options.
In order to use this new integration, existing merchants will need to visit the Partial.ly app in their BigCommerce merchant portal in order to grant Partial.ly the permission to access the new API. New Partial.ly merchants will automatically use the new API when connecting their BigCommerce account.
Here is an example of updating permissions for an existing account: