Change or add parameters to the name-value-pair string sent to PayPal when trying to create a subscription. Passes the nvpString and order object.

apply_filters( 'pmpro_create_recurring_payments_profile_nvpstr', string $nvpStr, MemberOrder $order );

Parameters

$nvpStr
string; A URL-encoded name-value pairs for the request and response fields of the checkout
$order
object; A full MemberOrder object

Source

File: https://github.com/strangerstudios/paid-memberships-pro/blob/master/classes/gateways/class.pmprogateway_paypalexpress.php

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