What are the HSM requirements for PTX? Cloud Payments Expert March 21, 2019 11:44 Updated Follow HSM-form.docx 60 KB Download Related articles What is a HSM and how does it work for PTX? How do I setup and configure the Bottomline PTX Auth App? How do I contact Bottomline? How do I authenticate with the Bacs Payment Services Website? I keep on getting an error saying "Unable to authenticate". How to make Indirect Submissions