To add or update payment to an existing order:

• Log in to your Addgene account
• Navigate to My Account
• Click on Open Orders to locate your order
• Select either Add Payment Information or Change Payment Information
• Choose your payment option (PO number or Credit Card)
• Enter your payment information
• Click Done with Changes

If you do not have access to the account that placed the order, please send an email to help@addgene.org for assistance.