What is the merge strategy used when using developer APIs to merge a PR

[maddy302]

Hi Community,

I am wondering, what is the merge strategy used while using developer REST APIs

http://example.com/rest/api/1.0/

 to merge a PR. 

I have set the default strategy to rebase + merge --no-ff for merges from the UI.  

I am on Bitbucket Server v6.10.1