Create custom images on the fly with custom text

Should be a basic system that does the following. I will have a photo of a check. I will be able to edit the name the amount on the check, and the memo of the check on the fly instantly by either changing an extension on the image. So for example if the domain name is [login to view URL] and I want to customize an image named [login to view URL] (I don't have the exact check yet, I just want to find someone who can do this, the price and turn around time. I could enter in the image URL of the image as: [login to view URL]'John Smith'&amount='$500'&memo='whatever I write in here" will appear in the memo Then when that URL is displayed it will be an email of the check with the name and amount written onto it. I don't care how it's done, just as long as there is a way I can customize each of the checks to show the exact amount and name of the person. These checks are not being printed, they are part of a marketing project I'm working on. They do not need to look 100% perfect, but look very clean. The font you should use should look like a printed check. Let me know if you have any samples of things you have created like this in the past.