Tax calculation in ePayco always uses VAT as reference

Problem/Motivation

Some orders have different taxes for different items, including shipment and other adjusts.

Steps to reproduce

Create different taxes in Drupal Commerce and create multiple items with different taxes.

Add shippment with a price that does not apply tax.

Create an order with tax-free items, add shipping, and pay with ePayco. The process will declare taxes with a different value than the one calculated by Drupal Commerce.

Proposed resolution

Use the information in the order to send the calculated taxes.