Multiple PayPal accounts linked to ONE installation of Woocommerce - php

Question

My issue: The client has 12 locations, each location is a different corporation hence a different PayPal account per business. By default woocommerce only supports one email to be entered to process the payment. The goal is to use one installation of wordpress / woocommerce then direct the user to the PayPal account associated with the location they have selected upon checkout.
My Theory / Attempt: originally I thought of implementing this feature by setting up a variation so the user can select a location which will then pass a parameter to the URL. The parameter would later be used within the PHP to overwrite the default email.
My Problem: I am having trouble with overwriting the default email that is entered within the admin settings, I cant seem to locate this email in the database. I am assuming the file pertaining this modification is located at: wp-content/plugins/woocommerce/includes/gateways/paypal but would prefer doing this the wordpress way vs editing core files, for obvious reasons. After doing some research I have found the following action shown below, but this is for the proceed to checkout button, I am looking to interact with the proceed to PayPal button. I am fluent in PHP but not the best with WordPress development. I would think this is a popular issue since majority of franchises would deal with such a scenario, but I am unpleasantly surprised on the amount of information regarding this topic. If someone could point me in the right direction of conquering this task it would be greatly appreciated!
remove_action('woocommerce_proceed_to_checkout','woocommerce_button_proceed_to_checkout', 20);
add_action('woocommerce_proceed_to_checkout', 'change_url_to_checkout', 20);
function change_url_to_checkout(){
$extra_url = 'put_your_extra_page_url_here';
?>
<?php _e( 'Proceed to Checkout', 'woocommerce' ); ?>
<?php
}

Answer 1

I can see two functions to be written here.
1. To alter the order data when an order is created. This is where we save the email needed.
add_action( 'woocommerce_checkout_update_order_meta', 'woocommerce_checkout_update_order_meta' );
function woocommerce_checkout_update_order_meta( $order_id ) {
$email = 'paypal#location1.com';
// do something here as to use the right email.
// you have $order_id.
// can be used as:
// $order = wc_get_order( $order_id );
// $order->get_billing_address_1() to get the address to check order address.
// or use $_POST['location'] if ever you posted some data.
update_post_meta( $order_id, '_alternative_paypal_email', $email );
}
2. Then use woocommerce_paypal_args to alter the args that is being passed to paypal.
add_filter( 'woocommerce_paypal_args', 'woocommerce_paypal_args', 10, 2 );
function woocommerce_paypal_args( $paypal_args, $order ) {
$email = get_post_meta( $order->get_id(), '_alternative_paypal_email', true );
if ( !empty( $email ) ) {
$paypal_args['business'] = $email;
}
return $paypal_args;
}
To summarize, this is just an example. But these two hooks is enough to get what you need.