Hi there,
I have gone through your project details and understand it very well. You want to integrate kinguin. net to your Shopify store. Well, I can help you to integrate this app. I got training from Udemy under a well experienced instructor who taught everything about Shopify. Besides, I did some sample works to get hand on experience regarding Shopify store set up.
I also got training to integrate third party api to Shopify store. I can finish this work withing one day for you.
Please let me help you. I will be glad if I can help you.
Regards,
Sourav