What does it do:

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This extension offers a "Purchase Order" payment option for customers, giving a field for them to enter a PO Number during checkout. Supports filtering by customer group so that only certain groups can see the purchase order option. Note this is only a payment module and replaces actual payments with a PO number. It is assumed the PO number will be paid later offline. This does not accept payment along with offering a PO Number.

Main features:

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* Presents a PO field during checkout for customer to enter a PO Number

* PO Field can be set to required or optional. Appropriate error if left blank.

* Filter out customer groups

* Adds PO Number to email and invoice

* PO is added to the database and displayed on the admin order page & customer account order history.