pmpro_checkout_oldemail

This hook controls whether or not to allow registrations with email addresses which have already been used. By default, PMPro does not allow multiple registrations with one email address and shows an error if the email address has already been used.

pmpro_wp_new_user_notification

Controls whether to send the default WordPress new user notifications when a user is created at checkout. By default, this is set to false.

pmpro_checkout_start_date

This hook pmpro_checkout_start_date allows you to change the start date of a membership before checkout.

pmpro_discount_code_level

This filter modifies the level  given by a discount code.  It passes the level object and the discount code ID.

pmpro_required_user_fields

Filters the required fields for the Account Information section on the checkout page. Passes the array of field names.

pmpro_confirmation_url

This filter changes the URL to redirect to on confirmation. By default, this redirects to the PMPro Confirmation page with pmpro_url("confirmation", "?level=" . $pmpro_level->id). It also passes the user ID of the current user and the level object.

pmpro_before_send_to_twocheckout

Execute code before sending the order to 2Checkout. This hook passes the user ID of the order’s customer and the MemberOrder object.

pmpro_after_checkout

Use this action to execute custom code after a user checks out, before any emails are sent. This hook passes the WordPress user’s id number and the membership order number.

pmpro_before_send_to_paypal_standard

This is executed at checkout before calling the sendToPayPal method on the order. The register helper plugin has been updated to update user meta fields during this hook in addition to the pmpro_after_checkout hook. (Because for PayPal Standard, when pmpro_after_checkout is called, the $_SESSION vars are unavailable to it. So other plugins relying on the pmpro_after_checkout hook may have issues with PayPal Standard.)