I've done a bit of research and turns out it is possible to retrieve data from Data Extension
with SOAP but not with REST. So far I've only seen examples of importing data to Data Extension
but not retrieving data. Can it be done? If so, how?
Ideally, I'd have a spring boot app that would essentially send a HTTP GET request and the response would contain the the data held in the data extension..
Best Answer
An example is included in the help docs:
https://developer.salesforce.com/docs/atlas.en-us.mc-apis.meta/mc-apis/retrieving_data_from_a_data_extension.htm
The API SDK are wrappers for SOAP and REST and are not required to be used