Paying for Registration
You can pay for conference registration in advance with a purchase card request form.
If you are required to provide payment on arrival, include this cost along with other expected costs when you request a cash advance for the trip. Use the cash advance request form.
The final option would be to seek reimbursement when you return from the conference. Use a business expense reimbursement request form. Reimbursement can only be made after the conference has taken place.