Reasons to offer online payment processing:
1. A convenience to customers/clients/members
2. A way to receive payments sooner
3. Automated/recurring billing
4. Elimination of printing, paper, envelopes, postage
5. To save money and time
Below are some of the available merchant services that can be integrated into your site. There are various models, service levels and fee structures that will ultimately affect which you choose.
Resources:
SitePoint Article regarding gateways |