L2G is legitimate. It stands for Link2Gov Corporation. The fee rates are listed on the IRS site. See: Pay by Debit or Credit Card when you e-file.
Watch out for scammers. For the official list of authorized resellers, see: Where can I obtain authentic TurboTax programs?
It is best to use only authorized resellers for TurboTax Downloads to avoid viruses, spyware, or other malware. Download directly from TurboTax.com or from a major online retailer.
To verify that your tax return(s) have been filed,
For more information, see: What Is Stolen Identity Refund Fraud? - TurboTax Tax Tips & Videos
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