We automate repository creation via a plugin and wanted setting “Jira issue commit checker” to be part of that. Internally it looks like Bitbucket uses IssueValidationConfigurationService but this service isn’t exposed to plugin developers. We’ve had to work around this by creating the repo, then hitting rest endpoints after creation.
(had to break up IssueValidationConfigurationService in the title because apparently that ‘word’ is too long to be in a title?)