A pile of unmaintained PHP code (srsly) that uses keypools, and is exclusively reliant on Blockchain(dot)(whatever)? Mark Karpelès did better than this.
But its author has spare dev cycles to make videos promoting it on Youtube.
https://github.com/coinables/NoNodePay
Here's a video demo and a walkthrough of how to set it up on just about any server, even free shared servers: https://www.youtube.com/watch?v=jBUnOFxe24s
Please, no.
The question from OP is on the Development Board, and the question was how would someone achieve this without using a node. I shared an old project that showed how one COULD DEVELOP their own solution by looking at how I created a simple shopping cart with very minimal code. It is not a product launch, and I'm not telling anyone to use it, but rather a sharing of ideas and approach of how to solve different solutions.
I know it's fun to make fun of PHP but it is a lot more helpful to see someone else's simple implementation instead of you typing on a board "just use an zpub bro". They can build on whatever stack they want. The simpiler, the easier to understand the concept and develop for it.
That is what this board is about.
Very few people are offering anything helpful and instead are just pumping their signature campaigns, so don't scold me about sharing a walkthrough on youtube.