Affiliate integration - Shopify store with MaxBounty

Hello! We currently have a Shopify store, and we just need some help with the affiliate integration. This should take less than 1 hour. We are pretty sure Shopify does not accept iFrames or postbacks, so we believe the only way is an image pixel. Here are the requirements from MaxBounty: "We can support 3 types of tracking: server to server (S2S), iframe pixel and image pixel. For example: Iframe Pixel: <iframe src="[login to view URL]" width=1 height=1 frameborder=0></iframe> Image Pixel: <img src=[login to view URL]<offerid>&r=<ratename>&d=xxxxx border=0 width=1 height=1> S2S Postback: [login to view URL] We require a unique tracking link that has a parameter for us to pass the advertiser a sub ID; the Advertiser needs to collect each sub ID per lead, in order to determine quality. For example: http://www.yourURLhere.com&source=uniquenameforMaxBounty&subid=12345 In this case, &source= a permanent ID associated to MaxBounty tracking links only, while &subid= a dynamic ID that we will pass the Advertiser, depending on which affiliate is running traffic. We require the Advertiser to pass us a unique lead ID (such as a transaction ID, order ID, username, phone number, etc) per conversion in the pixel or postback. This will be passed in the &d= parameter. The Advertiser should collect this information in order to identify each lead individually. For example: <iframe src="[login to view URL]" width=1 height=1 frameborder=0></iframe> In this case, “987654321” is the unique lead ID for that conversion. "