Yii2 Simple Invoice
The preferred way to install this extension is through composer.
Either run
php composer.phar require --prefer-dist harrytang/yii2-simpleinvoice "*"
or add
"harrytang/yii2-simpleinvoice": "*"
to the require section of your composer.json file.
then run
yii migrate --migrationPath=@vendor/harrytang/yii2-simpleinvoice/migrations/ --migrationTable={{%simpleinvoice_migration}}