Cubepoints in Wordpress Social Invitations

cubepoints.php

<?php
//full file located in functions/cubepoints.php

	/* Hook WSI Invitations sent */
	add_action( 'wsi_invitation_sent', 'wsi_points', 10 );
	function wsi_points( $user_id ) {
	
		//this is not a registered user
		if( empty($user_id)) return;
		
		// Grab settings
		$points_per_invite = get_option( 'wsi_points_invite' );
		$max_invites = get_option( 'wsi_max_invite' );
		
		if ( $max_invites != 0 ) {
			// Get number of invites already sent by this user
			$existing_number_of_invites = get_user_meta( $user_id, 'wsi_invites_counter', true );
			if ( !$existing_number_of_invites ) $existing_number_of_invites = 0;
		}
		else $existing_number_of_invites = 0;
		
		// Check if this invite gives points
		if ( $existing_number_of_invites <= $max_invites ) {
		
			// Give Points
			cp_points( 'wsi_sentinvite', $user_id, $points_per_invite, '' );
			
			if ( $max_invites != 0 ) {
				// Update counter
				$new_number_of_invites = $existing_number_of_invites+1;
				update_user_meta( $user_id, 'wsi_invites_counter', $new_number_of_invites );
			}
		}
	}
	
	/* Hook into WSI Invite Acceptance */
	add_action( 'wsi_invitation_accepted', 'wsi_accepted', 10, 2 );
	function wsi_accepted( $user_id, $stat ) {
	
		// Grab settings
		$points_per_accept = get_option( 'wsi_points_accept' );
		$max_accepts = get_option( 'wsi_max_accept' );
		
		//this is not a registered user
		if( empty($user_id)) return;		
		
			if ( $max_accepts != 0 ) {
				// Grab inviters existing number of acceptances
				$existing_number_of_accepts = get_user_meta( $inviter_id, 'wsi_invite_acceptance_counter', true );
				if ( !$existing_number_of_accepts ) $existing_number_of_accepts = 0;
			}
			else $existing_number_of_accepts = 0;
			
			// Check if this acceptance gives points
			if ( $existing_number_of_accepts <= $max_accepts ) {
			
				// Give Points
				cp_points( 'wsi_accept_invite', $user_id, $points_per_accept, '' );
			
				if ( $max_accepts != 0 ) {
					// Update counter
					$new_number_of_accepts = $existing_number_of_accepts+1;
					update_user_meta( $inviter_id, 'wsi_invite_acceptance_counter', $new_number_of_accepts );
				}
			}
		}