Widget for My Mitsu Estimation Form

My Mitsu, is a webservice in Japan, allows users to create an estimation(calculation) form. A powerful form allows you to create a conditional form with calculation, and outputs a PDF file. It is suited for business persons.
https://my-mitsu.com/ (written in Japanese.)

This plugin allows you to output an iframe html tag which displays a my mitsu form in your website’s widge area.

• Note * In order to create an estimation form, you need to register My Mitsu https://my-mitsu.jp/register .

Filter Sample

This plugin allows you to set your default values for URL, ID, width, and height. You can alter them by hooking the “mymitsu_widget_default_***” filter. Here is a sample code.

add_filter( 'mymitsu_widget_default_width', 'my_widget_default_width' );
 function my_widget_defaul…