diff --git a/.travis.yml b/.travis.yml
index 63e5e26..a4b237c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,9 @@ language: php
 sudo: false
 
 php:
-  - 7.0
   - 7.1
+  - 7.2
+  - 7.3
 
 matrix:
   fast_finish: true
diff --git a/composer.json b/composer.json
index 9dc3173..93c8840 100644
--- a/composer.json
+++ b/composer.json
@@ -18,11 +18,11 @@
 		}
 	],
 	"require": {
-		"php": "^7",
+		"php": "^7.1",
 		"composer/installers": "*",
 		"openbuildings/jam": "^0.5",
-		"openbuildings/purchases": "^0.9 | ^0.10",
-		"openbuildings/shipping": "^0.10 | ^0.11",
+		"openbuildings/purchases": "^0.11",
+		"openbuildings/shipping": "^0.13",
 		"openbuildings/jam-monetary": "^0.1.21"
 	},
 	"require-dev": {
diff --git a/composer.lock b/composer.lock
index 5938b9e..f38c23e 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0c90f3e45c700c918d493ac5a08f3aad",
+    "content-hash": "8c6b014d76803c9184f6b7bc2c401f06",
     "packages": [
         {
             "name": "clippings/freezable",
@@ -48,18 +48,70 @@
             "description": "Freeze values in objects",
             "time": "2014-10-17T12:21:06+00:00"
         },
+        {
+            "name": "clue/stream-filter",
+            "version": "v1.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/clue/php-stream-filter.git",
+                "reference": "d80fdee9b3a7e0d16fc330a22f41f3ad0eeb09d0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/clue/php-stream-filter/zipball/d80fdee9b3a7e0d16fc330a22f41f3ad0eeb09d0",
+                "reference": "d80fdee9b3a7e0d16fc330a22f41f3ad0eeb09d0",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^5.0 || ^4.8"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Clue\\StreamFilter\\": "src/"
+                },
+                "files": [
+                    "src/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Christian Lück",
+                    "email": "christian@lueck.tv"
+                }
+            ],
+            "description": "A simple and modern approach to stream filtering in PHP",
+            "homepage": "https://github.com/clue/php-stream-filter",
+            "keywords": [
+                "bucket brigade",
+                "callback",
+                "filter",
+                "php_user_filter",
+                "stream",
+                "stream_filter_append",
+                "stream_filter_register"
+            ],
+            "time": "2017-08-18T09:54:01+00:00"
+        },
         {
             "name": "composer/installers",
-            "version": "v1.2.0",
+            "version": "v1.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/installers.git",
-                "reference": "d78064c68299743e0161004f2de3a0204e33b804"
+                "reference": "cfcca6b1b60bc4974324efb5783c13dca6932b5b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/installers/zipball/d78064c68299743e0161004f2de3a0204e33b804",
-                "reference": "d78064c68299743e0161004f2de3a0204e33b804",
+                "url": "https://api.github.com/repos/composer/installers/zipball/cfcca6b1b60bc4974324efb5783c13dca6932b5b",
+                "reference": "cfcca6b1b60bc4974324efb5783c13dca6932b5b",
                 "shasum": ""
             },
             "require": {
@@ -71,7 +123,7 @@
             },
             "require-dev": {
                 "composer/composer": "1.0.*@dev",
-                "phpunit/phpunit": "4.1.*"
+                "phpunit/phpunit": "^4.8.36"
             },
             "type": "composer-plugin",
             "extra": {
@@ -101,12 +153,17 @@
             "keywords": [
                 "Craft",
                 "Dolibarr",
+                "Eliasis",
                 "Hurad",
                 "ImageCMS",
+                "Kanboard",
+                "Lan Management System",
                 "MODX Evo",
                 "Mautic",
+                "Maya",
                 "OXID",
                 "Plentymarkets",
+                "Porto",
                 "RadPHP",
                 "SMF",
                 "Thelia",
@@ -124,28 +181,36 @@
                 "croogo",
                 "dokuwiki",
                 "drupal",
+                "eZ Platform",
                 "elgg",
                 "expressionengine",
                 "fuelphp",
                 "grav",
                 "installer",
+                "itop",
                 "joomla",
                 "kohana",
                 "laravel",
+                "lavalite",
                 "lithium",
                 "magento",
+                "majima",
                 "mako",
                 "mediawiki",
                 "modulework",
+                "modx",
                 "moodle",
+                "osclass",
                 "phpbb",
                 "piwik",
                 "ppi",
                 "puppet",
+                "pxcms",
                 "reindex",
                 "roundcube",
                 "shopware",
                 "silverstripe",
+                "sydes",
                 "symfony",
                 "typo3",
                 "wordpress",
@@ -153,7 +218,7 @@
                 "zend",
                 "zikula"
             ],
-            "time": "2016-08-13T20:53:52+00:00"
+            "time": "2018-08-27T06:10:37+00:00"
         },
         {
             "name": "desarrolla2/cache",
@@ -207,70 +272,44 @@
             "time": "2013-07-10T12:22:00+00:00"
         },
         {
-            "name": "guzzle/guzzle",
-            "version": "v3.9.3",
+            "name": "guzzlehttp/guzzle",
+            "version": "6.3.3",
             "source": {
                 "type": "git",
-                "url": "https://github.com/guzzle/guzzle3.git",
-                "reference": "0645b70d953bc1c067bbc8d5bc53194706b628d9"
+                "url": "https://github.com/guzzle/guzzle.git",
+                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle3/zipball/0645b70d953bc1c067bbc8d5bc53194706b628d9",
-                "reference": "0645b70d953bc1c067bbc8d5bc53194706b628d9",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/407b0cb880ace85c9b63c5f9551db498cb2d50ba",
+                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba",
                 "shasum": ""
             },
             "require": {
-                "ext-curl": "*",
-                "php": ">=5.3.3",
-                "symfony/event-dispatcher": "~2.1"
-            },
-            "replace": {
-                "guzzle/batch": "self.version",
-                "guzzle/cache": "self.version",
-                "guzzle/common": "self.version",
-                "guzzle/http": "self.version",
-                "guzzle/inflection": "self.version",
-                "guzzle/iterator": "self.version",
-                "guzzle/log": "self.version",
-                "guzzle/parser": "self.version",
-                "guzzle/plugin": "self.version",
-                "guzzle/plugin-async": "self.version",
-                "guzzle/plugin-backoff": "self.version",
-                "guzzle/plugin-cache": "self.version",
-                "guzzle/plugin-cookie": "self.version",
-                "guzzle/plugin-curlauth": "self.version",
-                "guzzle/plugin-error-response": "self.version",
-                "guzzle/plugin-history": "self.version",
-                "guzzle/plugin-log": "self.version",
-                "guzzle/plugin-md5": "self.version",
-                "guzzle/plugin-mock": "self.version",
-                "guzzle/plugin-oauth": "self.version",
-                "guzzle/service": "self.version",
-                "guzzle/stream": "self.version"
+                "guzzlehttp/promises": "^1.0",
+                "guzzlehttp/psr7": "^1.4",
+                "php": ">=5.5"
             },
             "require-dev": {
-                "doctrine/cache": "~1.3",
-                "monolog/monolog": "~1.0",
-                "phpunit/phpunit": "3.7.*",
-                "psr/log": "~1.0",
-                "symfony/class-loader": "~2.1",
-                "zendframework/zend-cache": "2.*,<2.3",
-                "zendframework/zend-log": "2.*,<2.3"
+                "ext-curl": "*",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "psr/log": "^1.0"
             },
             "suggest": {
-                "guzzlehttp/guzzle": "Guzzle 5 has moved to a new package name. The package you have installed, Guzzle 3, is deprecated."
+                "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.9-dev"
+                    "dev-master": "6.3-dev"
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Guzzle": "src/",
-                    "Guzzle\\Tests": "tests/"
+                "files": [
+                    "src/functions_include.php"
+                ],
+                "psr-4": {
+                    "GuzzleHttp\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -282,13 +321,9 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
-                },
-                {
-                    "name": "Guzzle Community",
-                    "homepage": "https://github.com/guzzle/guzzle/contributors"
                 }
             ],
-            "description": "PHP HTTP client. This library is deprecated in favor of https://packagist.org/packages/guzzlehttp/guzzle",
+            "description": "Guzzle is a PHP HTTP client library",
             "homepage": "http://guzzlephp.org/",
             "keywords": [
                 "client",
@@ -299,8 +334,125 @@
                 "rest",
                 "web service"
             ],
-            "abandoned": "guzzlehttp/guzzle",
-            "time": "2015-03-18T18:23:50+00:00"
+            "time": "2018-04-22T15:46:56+00:00"
+        },
+        {
+            "name": "guzzlehttp/promises",
+            "version": "v1.3.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/promises.git",
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Promise\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Guzzle promises library",
+            "keywords": [
+                "promise"
+            ],
+            "time": "2016-12-20T10:07:11+00:00"
+        },
+        {
+            "name": "guzzlehttp/psr7",
+            "version": "1.5.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/psr7.git",
+                "reference": "9f83dded91781a01c63574e387eaa769be769115"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/9f83dded91781a01c63574e387eaa769be769115",
+                "reference": "9f83dded91781a01c63574e387eaa769be769115",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0",
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5"
+            },
+            "provide": {
+                "psr/http-message-implementation": "1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.5-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Psr7\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "PSR-7 message implementation that also provides common utility methods",
+            "keywords": [
+                "http",
+                "message",
+                "psr-7",
+                "request",
+                "response",
+                "stream",
+                "uri",
+                "url"
+            ],
+            "time": "2018-12-04T20:46:45+00:00"
         },
         {
             "name": "kohana/auth",
@@ -538,76 +690,183 @@
             ],
             "time": "2016-03-23T17:12:48+00:00"
         },
+        {
+            "name": "league/omnipay",
+            "version": "v3.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/thephpleague/omnipay.git",
+                "reference": "9e10d91cbf84744207e13d4483e79de39b133368"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/thephpleague/omnipay/zipball/9e10d91cbf84744207e13d4483e79de39b133368",
+                "reference": "9e10d91cbf84744207e13d4483e79de39b133368",
+                "shasum": ""
+            },
+            "require": {
+                "omnipay/common": "^3",
+                "php": "^5.6|^7",
+                "php-http/guzzle6-adapter": "^1.1|^2"
+            },
+            "require-dev": {
+                "omnipay/tests": "^3"
+            },
+            "type": "metapackage",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Adrian Macneil",
+                    "email": "adrian@adrianmacneil.com"
+                },
+                {
+                    "name": "Barry vd. Heuvel",
+                    "email": "barryvdh@gmail.com"
+                }
+            ],
+            "description": "Omnipay payment processing library",
+            "homepage": "https://omnipay.thephpleague.com/",
+            "keywords": [
+                "checkout",
+                "creditcard",
+                "omnipay",
+                "payment"
+            ],
+            "time": "2019-03-20T14:28:28+00:00"
+        },
+        {
+            "name": "moneyphp/money",
+            "version": "v3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/moneyphp/money.git",
+                "reference": "f6085de6c565e98d2f9a7311a605987b54e06d5e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/moneyphp/money/zipball/f6085de6c565e98d2f9a7311a605987b54e06d5e",
+                "reference": "f6085de6c565e98d2f9a7311a605987b54e06d5e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "php": ">=5.6"
+            },
+            "require-dev": {
+                "cache/taggable-cache": "^0.4.0",
+                "doctrine/instantiator": "^1.0.5",
+                "ext-bcmath": "*",
+                "ext-gmp": "*",
+                "ext-intl": "*",
+                "florianv/exchanger": "^1.0",
+                "florianv/swap": "^3.0",
+                "leanphp/phpspec-code-coverage": "^3.0 || ^4.0",
+                "moneyphp/iso-currencies": "^3.0",
+                "php-http/message": "^1.4",
+                "php-http/mock-client": "^1.0.0",
+                "phpspec/phpspec": "^3.0",
+                "phpunit/phpunit": "^5.7 || ^6.4 || ^7.0",
+                "psr/cache": "^1.0",
+                "symfony/phpunit-bridge": "^4"
+            },
+            "suggest": {
+                "ext-bcmath": "Calculate without integer limits",
+                "ext-gmp": "Calculate without integer limits",
+                "ext-intl": "Format Money objects with intl",
+                "florianv/exchanger": "Exchange rates library for PHP",
+                "florianv/swap": "Exchange rates library for PHP",
+                "psr/cache-implementation": "Used for Currency caching"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Money\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com"
+                },
+                {
+                    "name": "Mathias Verraes",
+                    "email": "mathias@verraes.net",
+                    "homepage": "http://verraes.net"
+                },
+                {
+                    "name": "Frederik Bosch",
+                    "email": "f.bosch@genkgo.nl"
+                }
+            ],
+            "description": "PHP implementation of Fowler's Money pattern",
+            "homepage": "http://moneyphp.org",
+            "keywords": [
+                "Value Object",
+                "money",
+                "vo"
+            ],
+            "time": "2019-02-07T18:01:35+00:00"
+        },
         {
             "name": "omnipay/common",
-            "version": "2.5.2",
+            "version": "v3.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/omnipay-common.git",
-                "reference": "54910f2ece6b1be64f5e53e2111dd1254d50ee49"
+                "reference": "66b7934abd2d54cde8b24c5d0b1a5e733339a7e9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/omnipay-common/zipball/54910f2ece6b1be64f5e53e2111dd1254d50ee49",
-                "reference": "54910f2ece6b1be64f5e53e2111dd1254d50ee49",
+                "url": "https://api.github.com/repos/thephpleague/omnipay-common/zipball/66b7934abd2d54cde8b24c5d0b1a5e733339a7e9",
+                "reference": "66b7934abd2d54cde8b24c5d0b1a5e733339a7e9",
                 "shasum": ""
             },
             "require": {
-                "guzzle/guzzle": "~3.9",
-                "php": ">=5.3.2",
-                "symfony/http-foundation": "~2.1|~3.0"
+                "moneyphp/money": "^3.1",
+                "php": "^5.6|^7",
+                "php-http/client-implementation": "^1",
+                "php-http/discovery": "^1.2.1",
+                "php-http/message": "^1.5",
+                "symfony/http-foundation": "^2.1|^3|^4"
             },
             "require-dev": {
-                "omnipay/tests": "~2.0",
-                "squizlabs/php_codesniffer": "~1.5"
+                "omnipay/tests": "^3",
+                "php-http/mock-client": "^1",
+                "phpro/grumphp": "^0.14",
+                "squizlabs/php_codesniffer": "^3"
+            },
+            "suggest": {
+                "league/omnipay": "The default Omnipay package provides a default HTTP Adapter."
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.5.x-dev"
-                },
-                "gateways": [
-                    "AuthorizeNet_AIM",
-                    "AuthorizeNet_SIM",
-                    "Buckaroo_CreditCard",
-                    "Buckaroo_Ideal",
-                    "Buckaroo_PayPal",
-                    "CardSave",
-                    "Coinbase",
-                    "Dummy",
-                    "Eway_Rapid",
-                    "FirstData_Connect",
-                    "GoCardless",
-                    "Manual",
-                    "Migs_ThreeParty",
-                    "Migs_TwoParty",
-                    "Mollie",
-                    "MultiSafepay",
-                    "Netaxept",
-                    "NetBanx",
-                    "PayFast",
-                    "Payflow_Pro",
-                    "PaymentExpress_PxPay",
-                    "PaymentExpress_PxPost",
-                    "PayPal_Express",
-                    "PayPal_Pro",
-                    "Pin",
-                    "SagePay_Direct",
-                    "SagePay_Server",
-                    "SecurePay_DirectPost",
-                    "Stripe",
-                    "TargetPay_Directebanking",
-                    "TargetPay_Ideal",
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