Nick here from Shopify.
There is definitely a choice of different pop-up apps you can look into and choose from to see if they are a good fit for what you are looking for. You can integrate the pop-ups so that they only pop up when someone visits a blog post and nowhere else on your store. There are three pop-up apps which I particularly like that you can see below:
You can see a larger list of pop-up apps from the Shopify App store here. It is then within the apps as to how it would work regarding linking the discount code based upon a call to action.
Hope this helps and at least points you in the right direction.
All the best, Nick
No problem at all.
When you say you want the app embedded on a blog post, can you elaborate a little more on what you exactly mean by that? Do you mean to have it in the blog post but not act as a pop-up? It seems like what you're looking for might be something quite customized. It could be worth reaching out to a Shopify Expert to see if it's something they might be able to help you with because of that. You can see the Shopify Expert directory from here.