How to add custom configs variables to custom shipping method?

Question

I have created a custom shipping method following this tutorial:

https://www.mageplaza.com/devdocs/magento-2-create-shipping-method/

Now I would need to add a couple of extra variables to admin configuration, and save it in any place to use it later when the checkout is done. How can I do that? Thanks!

Answer 1

You can add more field like below in your system.xml under group tag with id="simpleshipping" in above module-

<field id="custom_variable" translate="label" type="text" sortOrder="100" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
      <label>Custom Variable</label>
</field>

Now you can retrieve value of this field in any file like block or model or controller like this --

protected $_scopeConfig;

public function __construct(
     ...
     \Magento\Store\Model\ScopeInterface $scopeInterface,
     ...
)
{
    ...
    $this->_scopeConfig = $scopeInterface;
    ...
}

Then in your class' method you can call the following:

$this->scopeConfig->getValue('carriers/simpleshipping/custom_variable', \Magento\Store\Model\ScopeInterface::SCOPE_STORE);