Short custom Shopify customization

Job ID: 34066291

Budget: $10 – $30 USD

I need someone to modify/write the following script for Shopify.

When a customer clicks checkout to pay on the checkout page, the following will occur before;


The first item on the list will change its SKU to;
(Existing SKU) + Total sum of items, excluding items with the variant option "Once-Off" + Static String "-RSC"


That's it, I am based in South Africa, that's all I need.
Related categories: PHP JavaScript HTML Shopify Shopify Development