To bill a retail product to a customer's account, you will first need to ensure it is enabled under your Member Area. Once it's enabled, go to Members > Select a member > Services. Scroll down to Products and select + Assign product.
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Toggle on Make a payment before clicking Save. Uncheck "Make payment using..." > Under the Payment Type drop-down, select Bill to Account. Click Save.

*Note: If there is no credit card on file or if they do not have an active membership, the system will default to adding a credit card and grey out the option to Bill to Account.