You must be the Master Admin to access the Billing section.

Even if you were currently paying by invoice, you may switch to credit card payments at any time. 

Go to Admin/Account Settings/Billing.

Accepted Forms of Online Payment:

Visa
Master Card
Discover

Other forms of payment:

Direct Deposit/ACH
Invoice 

For these other options, please contact billing@imagerelay.com.

Further Reading:
The Image Relay Glossary 

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