code: func (p *PullRequest) GetMergeCommitSHA() string {
  	if p == nil || p.MergeCommitSHA == nil {
  		return ""
  	}
  	return *p.MergeCommitSHA
  }
docs: // GetMergeCommitSHA returns the MergeCommitSHA field if it's non-nil, zero value otherwise.