FR: Add ability to set the from location dynamically

[codyjames]

Description

We're wanting to use this plugin for a marketplace (peer-to-peer selling) website. However, I think we need the ability to set the FROM address on a per-cart basis.

From TaxJar (https://support.taxjar.com/article/165-what-if-i-dont-know-the-from-address-at-time-of-tax-estimation):

It is highly recommended to use the FROM address of the merchant selling the product (or multiple addresses) using the from_ or nexus_addresses parameters with the /v2/taxes endpoint. This will provide the most accurate sales tax calculation and determine if sales tax is actually due.

Can this plugin provide a way to do that?

The current FROM location is pulled from this setting, I think:

Go to Commerce → Store Settings → Store Location, and ensure that everything is set correctly there. The plugin will use this info to populate the from address when getting tax info from TaxJar.

[mike-moreau]

You may be able to achieve what you are after by modifying the request params sent to TaxJar using the ModifyRequestEvent in a Module.

https://github.com/craftcms/commerce-taxjar/blob/develop/src/adjusters/TaxJar.php#L184

<?php

// In your custom module
use yii\base\Module;
use craft\commerce\taxjar\adjusters\TaxJar as TaxJarAdjuster;
use craft\commerce\taxjar\events\ModifyRequestEvent as TaxJarModifyRequestEvent;

class General extends Module
{
    public function init()
    {
        // ....
        
        /**
         * Listen for the TaxJar Plugin's tax Adjuster, and modify the request
         * to the TaxJar API.
         */
        Event::on(
            TaxJarAdjuster::class,
            TaxJarAdjuster::EVENT_MODIFY_TAX_FOR_ORDER_REQUEST,
            function (TaxJarModifyRequestEvent $event) {
 
                // ...add or change params here...
                // $event->requestParams = ...

                // $event->order and $event->address are available too
            }
        );
    }
}