How to recharge Orange data?

Can you tell me how I can recharge my Orange data plan? I've been using it for a while but I'm not sure how to go about topping up my account. Is there a specific process I need to follow, or can I just use my credit card or debit card like I do with other services? Also, are there any discounts or promotions available for frequent recharges? I'd appreciate any information you can provide to help me keep my Orange data plan running smoothly.