Hosted Vault can't add credit card from api call, but at moneris backend the credit card was added, api call just return null, response code is null, message is null, please advise, thanks in advance!

Hello, you will need to collect the credit card information through a form post redirect which will return a data_key (token). You can then process the token through API or batch upload to process transactions. If that's exactly how you have structured your algorithm and you are still getting null returned, you can reach out to eproduct@moneris.com and an eProduct consultant will investigate on what might be going on with your code.