Screenshot Online App

Hello, we need an online Screenshot app similar to Lightshot and other competitors: 1) Take Screenshot (compatible with all browsers) 2) Save the full screen (full) from the "header" to the "footer" of any web page. Any page, from blogs, websites, even social networks like Facebook, etc ... As if it were an identical photo. 3) Identical copy of full page. And that cannot be changed by the user. 4) To store this COPY / PHOTO (Screenshot), saving in JPEG or equivalent (free choice), and this PHOTO (COPIA) must be stored, so that the user can download the PDF with timestamp. 5) The project consists of construction for PC, PlayStore, WindowsStore, and Apple Store. (but as I have urgency, I need to be made initially for PC browsers, and then finished for smartphone) 6) Inform if you have interest and time available to work on monthly maintenance of this app. We want a non-serviceable app, but we know there may be some kind of support or bug. 7) It is the choice of Freelancer to choose and deploy the payment gateway. State the reasons for the choice, and competition analysis. 8) Requires client and credit control platform (prepaid), as my legal clients will pay before use, and may have credits left to use. 9) Maybe if the control is easier, we can use the monthly payment system, with a lot of uses. Example: package 1: up to 5 uses mes (5 prints) Package 2: Up to 10 uses per month. package 3: up to 50 same uses 10) Completion period up to 5 days. If you need more days, justify, but I can't work long term. 11) Questions please ask before sending the bid amount. The chosen freelancer must sign a contract with us, as we already had another freelancer who was paid, and did not complete the service.