Controller Action to Store Using POST and service Provider

gistfile1.php

<?php 

/*In Provider*/
...
    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
       $this->app->bind('certificate.model.signature', Signature::class);
    }
...

/*In Controller*/
//...
public function store(Request $request)
    {
        try {
            \DB::beginTransaction();
            $signature = app('certificate.model.signature')->fill($request->all());
            $signature->signature_image_id = $request->all()['files'][0];
            $signature->save();

            \DB::commit();
            return redirect()->route('certificate.signature.index');
        } catch (\Exception $exception) {
            \DB::rollBack();

            flash('danger', trans('flash.save_error'), $exception->getMessage());

            return \Redirect::route('certificate.signature.create')
                ->withErrors($request->validate())
                ->withInput();
        }
    }
//...

/*In route*/

//...

        $this->post('store', [
            'uses' => 'SignatureController@store',
            'as' => 'certificate.signature.store'
        ]);
//...