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Addgene will occasionally issue a credit memo if your organization has sent a duplicate or over- payment. 

Using a Credit Memo when placing a new order

1. During the checkout process, select the option to Pay by Purchase Order, and enter your Credit Memo number in the Purchase Order Number field. 
2. Once you receive your invoice, email billing@addgene.org referencing your invoice number so that we can properly apply the credit.

Applying a Credit Memo to an open invoice 

1. Send an email to billing@addgene.org referencing your invoice number and credit memo number so that we can properly apply the credit.