CONTENTS OF THIS FILE

• Introduction
• Requirements
• Installation
• Configuration
• Custom exchange rates
• Plugin system
• Maintainers

INTRODUCTION

Currency exchange rates module for Drupal Commerce 2.

Features

1. Manual or remote exchange rates sources.
2. Built for Commerce 2
3. Exchange rates stored in dedicated database table.
4. Provide default price conversion calculator service.
5. Plugin based system.
6. Integration with Commerce Currency Resolver module
7. Store rates in historical table per each day.

Builtin exchange rates plugins are:

1. Manual plugin
2. TransferWise
3. Fixer (free and paid)
4. Currencylayer (free and paid)
5. European Central Bank

REQUIREMENTS

This module requires Drupal Commerce 2 and it's submodule price.

INSTALLATION

Install the Commerce Exchanger module as you would normally install any Drupal contrib module. Visit https://www.drupal.org/node/1897420 for further information.

CONFIGURATION

1. Navigate to Administration > Extend and enable the Commerce Exchanger
   module.
2. Navigate to Home > Administration > Commerce > Configuration
               > Exchange rates.

CUSTOM EXCHANGE RATES

For any provider (manual or remote) you can trough UI overwrite any ratio for any currency. Once you enable manually entered value, this one is going to be ignored from regular sync.

If you want to directly fill database table, skipping default cron, you can use service commerce_exchanger.manager and method \Drupal\commerce_exchanger\ExchangerManager::setLatest.

Even it's advisable that you write your own plugin if you need additional customization.

PLUGIN SYSTEM

See examples of implementation for external providers inside plugin namespace. \Drupal\commerce_exchanger\Plugin\Commerce\ExchangerProvider\

See \Drupal\commerce_exchanger\Annotation\CommerceExchangerProvider for available properties on CommerceExchangerProvider annotation plugin type.

In most cases it would be enough to make proper annotation type and implement two functions inside your plugin: ExchangerProviderRemoteInterface::apiUrl ExchangerProviderRemoteInterface::getRemoteData

Note that function getRemoteData() should return array keyed as examples below. If you follow that format, you don't need to implement anything more in your plugin.

['HRK' => '1.3', 'USD' => '1.666']

or

['base' => 'USD', 'rates' => ['HRK' => '1.3', 'EUR' => '1.666']]

Either format will work.

PLUGIN EXAMPLES

https://www.drupal.org/project/commerce_exchanger_hnb https://www.drupal.org/project/commerce_exchanger_nbu

PLUGIN ANNOTATION

All options \Drupal\commerce_exchanger\Annotation\CommerceExchangerProvider

Some specifics to single out:

base_currency

When external source locked to single currency source (as ECB). If you use this annotation, enterprise mode is not available, and exchange rates always calculated as cross conversion between non default currencies.

transform_rates

Usually most of the exchange rate providers are giving ratio based on base currency. Like 1 EUR = 1.116 USD, and you get data in json as

[
    {
        "rate": 1.166,
        "source": "EUR",
        "target": "USD",
        "time": "2018-08-31T10:43:31+0000"
    }
]

But some of them are doing reverse.

[
    {
        "rate": 0.84,
        "source": "EUR",
        "target": "USD",
        "time": "2018-08-31T10:43:31+0000"
    }
]

In these cases you need us transform_mode = TRUE annotation on your plugin.

MAINTAINERS

The 8.x-1.x branch was created by:

• Valentino Medimorec (valic) - https://www.drupal.org/u/valic