Renaming the payment method
When the buyer is on the payment method selection page, by default, the Systempay module will display: Payment by credit card.
It is possible to personalize this label to display, for instance: Card payment with Systempay
For this, open the systempay.php file, located in: Catalog\language\french\payment
Replace Payment by credit card by the desired label:
$_['text_systempay_title'] = 'Card payment with Systempay';
$_['text_systempay_multi_title'] = 'Card payment in %s installments with Systempay';