Price Tracker on a Website

Good evening, I have a website with several products. For this site I want to write a script. My ecommerce site is running opencart. I want a script to do the following: 1 - Check product prices every hour. (Free time selection. For example, the user can select every two hours.) 2 - The user must be able to specify the product price check period. For Example 8:00 - 21:00 2 - For faster operation, the user can choose to cancel some products from the check. Like products that have a lower sales price, if the program in one day has sometimes found the same price. (for example, if 3 times in a row he finds the same selling price on the product, then at the next price check he is left off the list.) - The times are user-selected. 3 - We have a database of product costs. The user can select the profit rate per product brand. For example: The product costs $ 10. The user wants 5% profit. But the best selling price is $ 20. While in our online store is $ 22. Then the program will not set the price $ 10.50. But $ 19.90. That is, each time he will consider whether he can make a better price 10 minutes less. Up to $ 10.50. 4 - The script must use some ip modification methods. Because, the site after some tests needs google robot confirmation. The way we are not interested. We just want the best possible with less cost. 5 - In cases where the script will not be able to find a product on the base, if it fails to get the best price, then it sends mail at the end of the day a detailed list of these products. * The programming language is at the discretion of the freelancer. On one condition. We want it to be open source. Preferably: PHP, Python. * The site will be given if needed with a personal message. ** I want the freelancer to inform me every 48 hours about the progress of the job.