Delete Sponsored Members discount code uses whenever a sponsored member is cancelled/expired

pmprosm_sponsored_discount_code_reuse.php

// Delete Sponsored Members discount code uses whenever a sponsored member is cancelled/expired
function my_pmprosm_sponsored_discount_code_reuse($level_id, $user_id) {
	global $pmpro_next_payment_timestamp;
	// if we see this global is set, other code is planning on giving them their level back
	if( !empty($pmpro_next_payment_timestamp) )
		return $level_id;
	//make sure they're cancelling and they have a sponsored level
	if( $level_id == 0 && pmprosm_isSponsoredLevel(pmpro_getMembershipLevelForUser($user_id)->ID) )
	{
		//get sponsor for user
		$sponsor = pmprosm_getSponsor($user_id, false);
		if( !empty($sponsor) )
		{
			//get the discount code for this user
			$code_id = pmprosm_getCodeByUserID($sponsor->ID);
			if( !empty( $code_id ) )
			{
				//remove the discount code use and update discount code
				pmprosm_removeDiscountCodeUse($user_id, $code_id);
			}
		}
	}
	return $level_id;
}
//filter this a little late so $pmpro_next_payment_timestamp is set
add_action( 'pmpro_before_change_membership_level', 'my_pmprosm_sponsored_discount_code_reuse', 12, 2);