Hi,
QRadar import threat feeds using QRadar Threat Intelligence (TI) App which eventually connects to a STIX/TAXII server endpoint.
So, if you are trying to integrate MISP, then you should create a custom STIX/TAXII server and then configure the QRadar TI App to discover the collections via your custom URL endpoint.
You can take a look at this github repo for reference:
https://github.com/MISP/MISP-Taxii-Server
https://github.com/MISP/MISP-STIX-Converter
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