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Here are some well known payment gateways available in the market with detailed development and integration guides, http://www.abcpayments.com http://www.ebs.in http://www.ccavenue.com http://www.authorize.net https://www.paypal.com http://www.paypoint.net This link may help you in choosing right payment gateway as per your requirements.

I welcome you to my blog, you will find here the latest information about Microsoft technologies like ASP.NET, C#, .NET framework 2.0,3.0,3.5, WCF, ASMX web services, AJAX, Javascript, SMS and payment gateways available in the market...

Following are some nice SMS gateways available in market with detailed development guides, http://www.clickatell.com http://www.celltrust.com http://www.smsxchange.com http://www.gateway4sms.com http://messaging.office.microsoft.com/HostingProviders.aspx This link gives you more details of choosing a good SMS gateway for your requirements.