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//My full Facade   /app/Facades/ITwrx/ITwrxCrypt.php

<?php

namespace App\Facades\ITwrx;

use Illuminate\Support\Facades\Facade;

/**
 * @see \Illuminate\Encryption\Encrypter
 */

class ITwrxCrypt extends Facade
{
    /**
     * Get the registered name of the component.
     *
     * @return string
     */
    protected static function getFacadeAccessor()
    {
        return 'ITwrxCrypt';
    }
}

--------------------------------------------------------------------------------------------------

//My nearly full Service Provider /app/Providers/ITwrx/ITwrxCryptServiceProvider.php

<?php

namespace App\Providers\ITwrx;

use RuntimeException;
use Illuminate\Support\Str;
use Illuminate\Support\ServiceProvider;
use Illuminate\Encryption\Encrypter;

class ITwrxCryptServiceProvider extends \Illuminate\Encryption\EncryptionServiceProvider
{
    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        
        $this->app->singleton('ITwrxCrypt', function ($app) {

//set custom $key, etc.

//return Encrypter.
            return new Encrypter($key, 'AES-256-CBC');

});
    }
    
}

-----------------------------------------------------------------------------------------------------

//My Command. app/Console/Commands/MyCommand.php    400+ loc not related to the problem at hand. below is the relevant code.

namespace App\Console\Commands;

use App\Facades\ITwrx\ITwrxCrypt;

//later, inside handle() method. the below used during troubleshooting.

$instance = ITwrxCrypt::getFacadeRoot();
                        
dd($instance);

//returns null.

-------------------

//the below is an example of what i need to actually use.

//manually decrypt value using hardcoded elocrypt prefix.
$decrypted_value = ITwrxCrypt::decrypt(str_replace('__ELOCRYPT__', '', $value));

//returns 'facade root has not been set', as getFacadeRoot() returns null.

-------------------------------------------------------------------------------------------------------

//Example of a controller using my facade successfully. /app/Http/Controllers/Books/Invoices/InvoicesCreateController.php     many loc not related to the problem at hand. below is the relevant code.

namespace App\Http\Controllers\Books\Invoices;

use App\Facades\ITwrx\ITwrxCrypt;

//later, inside get() method, for troubleshooting.

$instance = ITwrxCrypt::getFacadeRoot();
                        
dd($instance);

//returns an instance of laravel's Encrypter class via my facade and service provider, which extends the laravel service provider, which provides the Encrypter.php class.

---------------------

//the below is an example of what i actually use.

//manually decrypt value using hardcoded elocrypt prefix.
$decrypted_value = ITwrxCrypt::decrypt(str_replace('__ELOCRYPT__', '', $value));

//returns the decrypted value, as expected.