Cameroon is a mobile money–first market . Cards exist. But for most local customers, MTN MoMo and Orange Money  are the default. If your checkout does not support these two well, you will lose conversions. Simple. So the “best” payment gateway in Cameroon depends on what you are actually doing. If you sell locally, you want fast MTN MoMo and Orange Money checkout with clean settlement. If you sell across Africa or internationally, you want one integration  that works beyond C