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Edit File: stripe.php

<?php
/**
 * Seamless Donations by David Gewirtz, adopted from Allen Snook
 *
 * Lab Notes: http://zatzlabs.com/lab-notes/
 * Plugin Page: http://zatzlabs.com/seamless-donations/
 * Contact: http://zatzlabs.com/contact-us/
 *
 * Copyright (c) 2015-2020 by David Gewirtz
 *
 */

function seamless_donations_init_stripe($api_key) {
    \Stripe\Stripe::setAppInfo(
        'WordPress SeamlessDonationsStripe',
        get_option('dgx_donate_active_version'),
        'https://zatzlabs.com',
        'pp_partner_HLBzVKtlNzaGrU'           // Used by Stripe to identify your plugin
    );

\Stripe\Stripe::setApiKey($api_key);
    \Stripe\Stripe::setApiVersion('2017-06-05');

wp_enqueue_script('stripe', 'https://js.stripe.com/v3/');

if (isset($_SERVER['HTTPS'])) {
        // Present an error to the user
    }
}

function seamless_donations_stripe_get_payment_intent($payment_id) {
    $intent = \Stripe\PaymentIntent::retrieve(
        $payment_id,
        []
    );
    return $intent;
}

function seamless_donations_stripe_get_invoice_from_payment_intent($payment_id) {
    $intent     = seamless_donations_stripe_get_payment_intent($payment_id);
    $invoice_id = $intent->invoice;
    return $invoice_id;
}

function seamless_donations_stripe_get_invoice($invoice_id) {
    $invoice = \Stripe\Invoice::retrieve(
        $invoice_id,
        []
    );
    return $invoice;
}

function seamless_donations_stripe_get_subscription_from_invoice($invoice_id) {
    $invoice         = seamless_donations_stripe_get_invoice($invoice_id);
    $subscription_id = $invoice->subscription;
    return $subscription_id;
}

function seamless_donations_stripe_get_invoice_list_from_subscription($subscription_id, $days = 30) {
    $invoice_array = array();
    $invoice_list  = \Stripe\Invoice::all([
        'created'      => [
            // Check for subscriptions created in the last year.
            'gte' => time() - $days * 24 * 60 * 60,
        ],
        'subscription' => $subscription_id,
    ]);
    foreach ($invoice_list->autoPagingIterator() as $invoice) {
        $reason                     = $invoice->billing_reason;
        $invoice_id                 = $invoice->id;
        $invoice_array[$invoice_id] = $reason;
    }
    return $invoice_array;
}

function seamless_donations_stripe_get_subscription($subscription_id) {
    $subscription = \Stripe\Subscription::retrieve(
        $subscription_id,
        []
    );
    return $subscription;
}

function seamless_donations_stripe_get_latest_invoice_from_subscription($subscription_id) {
    $subscription = seamless_donations_stripe_get_subscription($subscription_id);
    $latest       = $subscription->latest_invoice;
    return $latest;
}

function seamless_donations_stripe_is_first_invoice_of_subscription($invoice_id, $days = 30) {
    $subscription_id = seamless_donations_stripe_get_subscription_from_invoice($invoice_id);
    $list            = seamless_donations_stripe_get_invoice_list_from_subscription($subscription_id, $days);
    if ($list[$invoice_id] == 'subscription_update') {
        return true;
    }
    return false;
}

function seamless_donations_stripe_get_event_history_json($days = 1) {
    dgx_donate_debug_log('Entering Stripe event scan');
    $event_log     = '';
    $currency_code = get_option('dgx_donate_currency');
    $server_mode   = get_option('dgx_donate_stripe_server');
    if ($server_mode == 'LIVE') {
        $stripe_secret_key = get_option('dgx_donate_live_stripe_secret_key');
        $endpoint_secret   = get_option('dgx_donate_live_webhook_stripe_secret_key');
    } else {
        $stripe_secret_key = get_option('dgx_donate_test_stripe_secret_key');
        //$stripe_secret_key = get_option('dgx_donate_test_stripe_api_key');
        $endpoint_secret = get_option('dgx_donate_test_webhook_stripe_secret_key');
    }

// Set your secret key. Remember to switch to your live secret key in production!
    // See your keys here: https://dashboard.stripe.com/account/apikeys
    \Stripe\Stripe::setApiKey($stripe_secret_key);
    dgx_donate_debug_log('Stripe API key set');

// 'dgx_donate_stripe_event_type_to_scan'
    $stripe_event_query_array = [
        //'type'    => 'checkout.session.completed',
        'created' => [
            // Check for events created in the last 24 hours.
            'gte' => time() - 24 * 60 * 60 * $days,
        ],
    ];

$stripe_event_type_to_scan = get_option('dgx_donate_stripe_event_type_to_scan');
    if ($stripe_event_type_to_scan != 'ALL') {
        $stripe_event_query_array['type'] = $stripe_event_type_to_scan;
    }

$events = \Stripe\Event::all($stripe_event_query_array);

dgx_donate_debug_log('Stripe events object created');

foreach ($events->autoPagingIterator() as $event) {
        if($event_log != '') {
            $event_log .= PHP_EOL . PHP_EOL;
        }
        $stripe_event_id             = $event->id;
        $stripe_event_created        = $event->created;
        $stripe_event_created_string = date('m/d/Y H:i:s', $stripe_event_created);
        $stripe_event_livemode       = $event->livemode;
        $stripe_event_type           = $event->type;

$event_log .= "EVENT ID: " . $stripe_event_id . PHP_EOL;
        $event_log .= "EVENT TYPE: " . $stripe_event_type . PHP_EOL;
        $event_log .= "EVENT CREATED: " . $stripe_event_created_string . PHP_EOL;
        $event_log .= "LIVE MODE: " . $stripe_event_livemode . PHP_EOL;

$stripe_retrieved_event = \Stripe\Event::retrieve(
            $stripe_event_id,
            []
        );

$json                   = $stripe_retrieved_event->toJSON();
        // I would modify dgx_donate_debug_log('Checking for donations'); to explicitly log the count of $events->data and the first element
        $event_log .= $json;

}
    return $event_log;
}