• open composer.json
• add "qwaszx000/liqpay_form": "*" in "require": {...
• execute composer update

• open ./vendor/qwaszx000/liqpay_form/src/LiqPay/config.php and configurate it with your data
• create widget by <?= LiqPay\LiqPayForm::widget(['amount' => '***', 'description' => '***', 'order_id' => '***']) ?>

Optional param: action (will be got from config file if not selected in LiqPay\LiqPayForm::widget([...]))

<?= LiqPay\LiqPayForm::widget(['amount' => '123', 'description' => 'description', 'order_id' => '0050']) ?>