Change or add parameters to an name-value-pair string sent to PayPal in a couple cases. Passes the nvpString and order object.

apply_filters("pmpro_paypal_standard_nvpstr", string $nvpStr, MemberOrder $order);

Parameters

$nvpStr
string
$order
MemberOrder

Source

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

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