code: func GetCredentialSupport() *CredentialSupport {
  
  	once.Do(func() {
  		credSupport = &CredentialSupport{
  			CASupport: &CASupport{
  				AppRootCAsByChain:     make(map[string][][]byte),
  				OrdererRootCAsByChain: make(map[string][][]byte),
  			},
  		}
  	})
  	return credSupport
  }
docs: // GetCredentialSupport returns the singleton CredentialSupport instance