Hello. I am evaluating Emma as a potential solution. I would like to send an automated email to all our customers that have not login to our PC app in the last 14 days. This last login information is stored in our Mongo Database driven by php. If I want to automate this, does it mean I need to use Emma's integration API (eg http://api.myemma.com/api/external/fields.html) and upload data to Emma each time our login data is updated?