Issue
Using the Xplenty add-on with Private Spaces database, we need to know which IP addresses to grant access to.
Resolution
Datastores within private spaces are private by default, meaning that external access (even to add-on providers) is not permitted initially.
In order to use external connections to a private spaces database, you will need to enroll in the Trusted IPs for Data Services program: https://devcenter.heroku.com/articles/private-spaces#trusted-ip-ranges-for-data-services
With this in place you need to grant access to the IPs used by Xplenty in order to have their add-on work. You can find a list of their current IP ranges here:
https://www.xplenty.com/docs/xplentys-ip-list/