code: @Override
  	public CommerceAccount fetchCommerceAccountByReferenceCode(long companyId,
  		String externalReferenceCode) {
  		return commerceAccountPersistence.fetchByC_ERC(companyId, null);
  	}
docs: Returns the commerce account with the matching external reference code and company.
  
  @param companyId the primary key of the company
  @param externalReferenceCode the commerce account's external reference code
  @return the matching commerce account, or <code>null</code> if a matching commerce account could not be found