diff --git a/Tests/prepaymentwebhook_test.json b/Tests/prepaymentwebhook_test.json
new file mode 100644
index 0000000..3e81ef8
--- /dev/null
+++ b/Tests/prepaymentwebhook_test.json
@@ -0,0 +1,242 @@
+{
+    "_links": {
+    },
+    "_embedded": {
+        "fx:items": [
+            {
+                "_links": {
+                },
+                "_embedded": {
+                    "fx:item_options": [
+                        {
+                            "_links": {
+                            },
+                            "name": "size",
+                            "value": "medium",
+                            "price_mod": 0,
+                            "weight_mod": 0,
+                            "date_created": null,
+                            "date_modified": null
+                        },
+                        {
+                            "_links": {
+                            },
+                            "name": "color",
+                            "value": "red",
+                            "price_mod": 0,
+                            "weight_mod": 0,
+                            "date_created": null,
+                            "date_modified": null
+                        }
+                    ],
+                    "fx:item_category": {
+                        "_links": {
+                        },
+                        "admin_email_template_uri": "",
+                        "customer_email_template_uri": "",
+                        "code": "DEFAULT",
+                        "name": "Default for all products",
+                        "item_delivery_type": "flat_rate",
+                        "max_downloads_per_customer": 3,
+                        "max_downloads_time_period": 24,
+                        "default_weight": 0,
+                        "default_weight_unit": "LBS",
+                        "default_length_unit": "IN",
+                        "shipping_flat_rate_type": "per_item",
+                        "shipping_flat_rate": 5,
+                        "handling_fee_type": "none",
+                        "handling_fee": 0,
+                        "handling_fee_minimum": 0,
+                        "handling_fee_percentage": 0,
+                        "customs_value": 0,
+                        "discount_type": "",
+                        "discount_name": "",
+                        "discount_details": "",
+                        "send_customer_email": false,
+                        "send_admin_email": false,
+                        "admin_email": "",
+                        "date_created": null,
+                        "date_modified": null
+                    }
+                },
+                "item_category_uri": "https://api.foxycart.com/item_categories/100",
+                "name": "Example Product",
+                "price": 15.99,
+                "quantity": 1,
+                "quantity_min": 0,
+                "quantity_max": 0,
+                "weight": 0,
+                "code": "1234",
+                "parent_code": "",
+                "discount_name": "",
+                "discount_type": "",
+                "discount_details": "",
+                "subscription_frequency": "",
+                "subscription_start_date": null,
+                "subscription_next_transaction_date": null,
+                "subscription_end_date": null,
+                "is_future_line_item": false,
+                "shipto": "Me",
+                "url": "",
+                "image": "",
+                "length": 0,
+                "width": 0,
+                "height": 0,
+                "expires": 0,
+                "date_created": null,
+                "date_modified": "2017-07-20T04:13:08-0700"
+            },
+            {
+                "_links": {
+                },
+                "_embedded": {
+                    "fx:item_category": {
+                        "_links": {
+                        },
+                        "admin_email_template_uri": "",
+                        "customer_email_template_uri": "",
+                        "code": "live",
+                        "name": "Live Rates",
+                        "item_delivery_type": "shipped",
+                        "max_downloads_per_customer": 3,
+                        "max_downloads_time_period": 24,
+                        "default_weight": 5,
+                        "default_weight_unit": "LBS",
+                        "default_length_unit": "IN",
+                        "shipping_flat_rate_type": "per_order",
+                        "shipping_flat_rate": 1,
+                        "handling_fee_type": "none",
+                        "handling_fee": 0,
+                        "handling_fee_minimum": 0,
+                        "handling_fee_percentage": 0,
+                        "customs_value": 0,
+                        "discount_type": "",
+                        "discount_name": "",
+                        "discount_details": "",
+                        "send_customer_email": false,
+                        "send_admin_email": false,
+                        "admin_email": "",
+                        "date_created": null,
+                        "date_modified": null
+                    }
+                },
+                "item_category_uri": "https://api.foxycart.com/item_categories/101",
+                "name": "Another Product",
+                "price": 20,
+                "quantity": 1,
+                "quantity_min": 0,
+                "quantity_max": 0,
+                "weight": 5,
+                "code": "foo321",
+                "parent_code": "",
+                "discount_name": "",
+                "discount_type": "",
+                "discount_details": "",
+                "subscription_frequency": "",
+                "subscription_start_date": null,
+                "subscription_next_transaction_date": null,
+                "subscription_end_date": null,
+                "is_future_line_item": false,
+                "shipto": "Me",
+                "url": "",
+                "image": "",
+                "length": 0,
+                "width": 0,
+                "height": 0,
+                "expires": 0,
+                "date_created": null,
+                "date_modified": "2017-07-20T04:14:03-0700"
+            }
+        ],
+        "fx:discounts": [
+            {
+                "code": "coupon",
+                "amount": -3.6,
+                "name": "Default Discount",
+                "display": "-$3.60",
+                "is_taxable": false,
+                "is_future_discount": false
+            }
+        ],
+        "fx:custom_fields": [
+            {
+                "name": "custom_note",
+                "value": "Happy Birthday!",
+                "is_hidden": 0
+            }],
+        "fx:shipment": {
+            "address_name": "",
+            "first_name": "John",
+            "last_name": "Smith",
+            "company": "",
+            "address1": "Main Street",
+            "address2": "",
+            "city": "Saint Paul",
+            "region": "MN",
+            "postal_code": "55116",
+            "country": "US",
+            "origin_region": "TX",
+            "origin_postal_code": "77018",
+            "origin_country": "US",
+            "shipping_service_id": 0,
+            "shipping_service_description": "",
+            "is_residential": false,
+            "item_count": 2,
+            "total_weight": 5,
+            "total_customs_value": 0,
+            "total_handling_fee": 0,
+            "total_flat_rate_shipping": 5,
+            "total_item_price": 35.99,
+            "total_tax": 3.24,
+            "total_shipping": 0,
+            "total_price": 39.23
+        },
+        "fx:customer": {
+            "id": "1512345",
+            "first_name": "John",
+            "last_name": "Smith",
+            "email": "john@example.com",
+            "tax_id": "",
+            "is_anonymous": "0",
+            "_embedded": {
+                "fx:payments": [
+                    {
+                        "cc_type": "plastic",
+                        "cc_number_masked": "xxxx xxxx xxxx 4242",
+                        "cc_exp_month": "10",
+                        "cc_exp_year": "2020",
+                        "purchase_order": null
+                    }
+                ],
+                "fx:default_billing_address": {
+                    "country": "US",
+                    "region": "MN",
+                    "city": "Saint Paul",
+                    "postal_code": "55116",
+                    "address1": "Main Street",
+                    "address2": "",
+                    "company": "",
+                    "full_name": "John Smith",
+                    "first_name": "John",
+                    "last_name": "Smith",
+                    "phone": ""
+                }
+            }
+        }
+    },
+    "customer_uri": "",
+    "template_set_uri": "",
+    "language": "",
+    "locale_code": "en_US",
+    "customer_ip": "192.168.0.1",
+    "ip_country": "United States",
+    "session_name": "fcsid",
+    "session_id": "hvcv28l8md0qc8qt5rrjh4qo85",
+    "total_item_price": 35.99,
+    "total_tax": 3.24,
+    "total_shipping": 14.23,
+    "total_future_shipping": 0,
+    "total_order": 49.86,
+    "date_created": null,
+    "date_modified": "2017-07-20T04:12:25-0700"
+}
\ No newline at end of file
diff --git a/prepaymentwebhookfunctions.php b/prepaymentwebhookfunctions.php
new file mode 100644
index 0000000..64427bc
--- /dev/null
+++ b/prepaymentwebhookfunctions.php
@@ -0,0 +1,74 @@
+<?php
+//Exit if not called in proper context
+if (!defined('ABSPATH')) exit();
+
+function check_inventory($cart_details, $local_test, $wpdb) {
+    $response = array(
+        'ok' => true,
+        'details' => ''
+    );
+
+    $log_file = './log.txt';
+    $date = new DateTime();
+    $date_string = $date->format('Y-m-d H:i:s');
+     
+    $log_line = $date_string . ': ' . $cart_details['customer_ip'] . ' - '. $cart_details['_embedded']['fx:customer']['email'] . ' -- ';
+
+    $no_stock_products = array();
+    $limited_stock_products = array();
+
+    foreach($cart_details['_embedded']['fx:items'] as $item) {
+        $product_id = -1;
+        $code = $item['code'];
+
+        $inv_code = "%" . $wpdb->esc_like($code) . "%";
+        $sql = $wpdb->prepare( "SELECT * FROM $wpdb->postmeta WHERE meta_key = %s AND meta_value LIKE %s", '_inventory_levels', $inv_code );
+        $meta_list = $wpdb->get_results( $sql );
+
+        foreach ($meta_list as $meta) {
+            $product_id = $meta->post_id;
+            $val = unserialize($meta->meta_value);
+            if (!is_array($val)) $val = array();
+            foreach ($val as $ivcode => $iv) {
+                if ($ivcode == $code) {
+                    $inventory = $iv['count'];
+                    if ($inventory === 0) {
+                        array_push($no_stock_products, $item['name']);
+                    }
+                    else if ($item['quantity'] > $inventory) {
+                        array_push($limited_stock_products, $item['name']);
+                    }
+                    break;
+                }
+            }
+        }
+    }
+
+    $response_text = "";
+
+    if (count($no_stock_products) > 0) {
+        $response_text = "Sorry, we are currently out of stock of the following " . ((count($no_stock_products) > 1) ? "items" : "item") . ": " . join(", ", $no_stock_products) . ". Please remove " . ((count($no_stock_products) > 1) ? "them" : "it") . " from your cart and try again.";
+    }
+
+    if (count($limited_stock_products) > 0) {
+        if ($response_text) {
+            $response_text .= "/n";
+        }
+        $response_text .= "Sorry, we currently have only limited stock of the following " . ((count($limited_stock_products) > 1) ? "items" : "item") . ": " . join(", ", $limited_stock_products) . ". Please reduce the quantity of " . ((count($limited_stock_products) > 1) ? "them" : "it") . " in your cart and try again.";
+    }
+
+    if ($response_text) {
+        $response['ok'] = false;
+        $response['details'] = $response_text; 
+    }
+
+    $log_line .= (string) $response['ok'] . "\n";
+    $fp = fopen($log_file, 'a');
+    fwrite($fp, $log_line);
+
+    if ($local_test === false) {
+        header('Content-Type: application/json');
+    }
+	return $response;
+}
+?>
diff --git a/settings-page.php b/settings-page.php
index e1ef89c..52e7992 100755
--- a/settings-page.php
+++ b/settings-page.php
@@ -247,6 +247,12 @@ function foxyshop_settings_page() {
 					<input type="text" id="foxyshop_datafeed_url" name="foxyshop_datafeed_url" value="<?php echo esc_url(get_bloginfo('url') . '/foxycart-datafeed-' . $foxyshop_settings['datafeed_url_key']); ?>/" readonly="readonly" onclick="this.select();" />
 					<a href="#" class="foxyshophelp">FoxyCart can be configured to send order information to a url on your website. If you want to use FoxyShop's datafeed and take advantage of inventory, user management and more, copy this url and enable the datafeed in your FoxyCart admin panel.</a>
 
+					<div style="clear: both;"></div>
+
+					<label for="foxyshop_prepayment_webhook_url"><?php _e('Prepayment Webhook URL', 'foxyshop'); ?>:</label>
+					<input type="text" id="foxyshop_prepayment_webhook_url" name="foxyshop_prepayment_webhook_url" value="<?php echo esc_url(get_bloginfo('url') . '/foxycart-prepayment-webhook-' . $foxyshop_settings['datafeed_url_key']); ?>/" readonly="readonly" onclick="this.select();" />
+					<a href="#" class="foxyshophelp">FoxyCart can be configured to send order information to a url on your website for a final check before completing the order. If you want to use FoxyShop's prepayment webhook and do a final check of inventory or for a custom prepayment check, copy this url and enable the prepayment webhook in your FoxyCart admin panel.</a>
+
 					<div style="clear: both;margin-bottom: 5px;"></div>
 
 					<label for="foxyshop_sso_url"><?php _e('SSO Endpoint', 'foxyshop'); ?>:</label>
diff --git a/templateredirect.php b/templateredirect.php
index 47ad1a9..9f468ee 100755
--- a/templateredirect.php
+++ b/templateredirect.php
@@ -28,7 +28,7 @@ function foxyshop_theme_redirect() {
 		$request_arr = explode("/",$wp->request);
 		$request_start = $request_arr[0];
 		$request_end = end($request_arr);
-		$foxyshop_indicators = array(FOXYSHOP_PRODUCTS_SLUG, FOXYSHOP_PRODUCT_CATEGORY_SLUG, 'product-search', 'foxycart-datafeed-'.$foxyshop_settings['datafeed_url_key'], 'foxycart-sso-'.$foxyshop_settings['datafeed_url_key'], 'upload-'.$foxyshop_settings['datafeed_url_key']);
+		$foxyshop_indicators = array(FOXYSHOP_PRODUCTS_SLUG, FOXYSHOP_PRODUCT_CATEGORY_SLUG, 'product-search', 'foxycart-datafeed-'.$foxyshop_settings['datafeed_url_key'], 'foxycart-prepayment-webhook-'.$foxyshop_settings['datafeed_url_key'], 'foxycart-sso-'.$foxyshop_settings['datafeed_url_key'], 'upload-'.$foxyshop_settings['datafeed_url_key']);
 		if (array_intersect($request_arr, $foxyshop_indicators)) {
 			if (in_array(FOXYSHOP_PRODUCTS_SLUG, $request_arr) && $request_end != FOXYSHOP_PRODUCTS_SLUG) {
 				$currentProduct = $request_end;
@@ -57,6 +57,8 @@ function foxyshop_theme_redirect() {
 				$currentPageName = 'product-search';
 			} elseif ($request_start == 'foxycart-datafeed-'.$foxyshop_settings['datafeed_url_key']) {
 				$currentPageName = 'foxycart-datafeed-'.$foxyshop_settings['datafeed_url_key'];
+			} elseif ($request_start == 'foxycart-prepayment-webhook-'.$foxyshop_settings['datafeed_url_key']) {
+				$currentPageName = 'foxycart-prepayment-webhook-'.$foxyshop_settings['datafeed_url_key'];
 			} elseif ($request_start == 'foxycart-sso-'.$foxyshop_settings['datafeed_url_key']) {
 				$currentPageName = 'foxycart-sso-'.$foxyshop_settings['datafeed_url_key'];
 			} elseif ($request_start == 'upload-'.$foxyshop_settings['datafeed_url_key']) {
@@ -141,6 +143,15 @@ function foxyshop_theme_redirect() {
 		include foxyshop_get_template_file('foxyshop-datafeed-endpoint.php');
 		die;
 
+	//FoxyCart Prepayment Webhook Endpoint
+	} elseif ($currentPageName == 'foxycart-prepayment-webhook-'.$foxyshop_settings['datafeed_url_key'] || $currentName == 'foxycart-prepayment-webhook-'.$foxyshop_settings['datafeed_url_key']) {
+		add_filter('body_class', 'foxyshop_body_class', 10, 2 );
+		status_header(200);
+		if (!defined("IS_FOXYSHOP")) define("IS_FOXYSHOP", 1);
+		$wp_query->is_404 = false;
+		include foxyshop_get_template_file('foxyshop-prepayment-webhook-endpoint.php');
+		die;
+
 	//FoxyCart SSO Endpoint
 	} elseif ($currentPageName == 'foxycart-sso-'.$foxyshop_settings['datafeed_url_key'] || $currentName == 'foxycart-sso-'.$foxyshop_settings['datafeed_url_key']) {
 		status_header(200);
diff --git a/themefiles/foxyshop-prepayment-webhook-endpoint.php b/themefiles/foxyshop-prepayment-webhook-endpoint.php
new file mode 100644
index 0000000..cc4dffd
--- /dev/null
+++ b/themefiles/foxyshop-prepayment-webhook-endpoint.php
@@ -0,0 +1,59 @@
+<?php 
+
+/*
+------------ ATTENTION ------------
+If you need to edit this template, do not edit the version in the plugin directory. Place a copy in your template folder and edit it there.
+This will allow you to upgrade FoxyShop without breaking your customizations. More details here: http://www.foxy-shop.com/documentation/theme-customization/
+-----------------------------------
+*/
+
+
+//Set Globals and Get Settings
+global $wpdb;
+require(FOXYSHOP_PATH.'/prepaymentwebhookfunctions.php');
+
+//TODO? EXTERNAL WEBHOOKS
+//-----------------------------------------------------
+
+//BUILT-IN FEATURES
+//-----------------------------------------------------
+
+$rawPost = file_get_contents('php://input');
+$cart_details = json_decode($rawPost, true);
+$local_test = false;
+
+//TROUBLESHOOTING
+//-----------------------------------------------------
+// For testing, uncomment the following to write datafeed to file in theme folder so you can examine
+// $file = STYLESHEETPATH.'/prepaymentwebhook.json';
+// $fh = fopen($file, 'a') or die("Couldn't open $file for writing!");
+// fwrite($fh, json_encode($cart_details));
+// fclose($fh);
+
+//-----------------------------------------------------
+
+/* 
+To test locally:
+  1. Navigate to ../Tests folder within the plugin
+  2. Copy the prepaymentwebhook_test.json file to your theme folder
+  3. Modify the file to fit your test case
+  4. Uncomment the following which will load the cart details from sample file
+*/
+// $path = STYLESHEETPATH.'/prepaymentwebhook_test.json';
+// $jsonString = file_get_contents($path);
+// $cart_details = json_decode($jsonString, true);
+// var_dump($cart_details);
+// $local_test = true;
+
+//Uncomment These If You Need Help Troubleshooting
+// error_reporting(E_ALL);
+// ini_set('display_errors','On');
+
+if ($cart_details) {
+    // inventory check
+    print json_encode(check_inventory($cart_details, $local_test, $wpdb));
+    // add custom checks here
+} else {
+    echo("No payload found");
+}
+?>