Project 1: Keep changed files from updated / Project 2: Add option for users to pay credit card fee - repost

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
Hi There. I am searching for help with 2 tweaks on one website:

Tweak 1:
When creating a website for a small non-profit, I made several changes to the CSS style sheet, the woo commerce files and some of the core files. When WooCommerce or Wordpress updates, the changes to be overwritten. Need a solution so everything will remain in tact. I can provide a list of files that have been changed.

Tweak 2:
Add a check box to the donation page where users can choose to pay the fees of the credit cards or PayPal. When the user visits the Donation Page, they will see that they have chosen to pay the fee and how much the fee is. If they did not check the box, then they proceed as usual with their chosen donation amount. If it is possible, it would be good if they could turn this off again, should they change their minds before checkout. The check box can be placed either on the initial donation page where users enter their amount, or in the WooCommerce section before checkout (see the options in the mock-ups attached).

There are two separate rates that need to be calculated:
Discover, Visa, Paypal, & Master Card = 2.2% + $0.30 per donation
American Express = 3.5%

If you have questions please let me know. Thank you.

Skills required:
CSS, Joomla, PHP, Website Design, Wordpress
Additional Files: example-credit cards.jpg example-credit-cards.jpg example-donation-page.jpg
About the employer:
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