Consistently use "monetization" across the repo, currently both monetization and monetisation is used :)
I think the flow is still a bit disjoint and might be confusing (I actually got lost). To me a reader should follow the below flow and we need to restructure the content a bit:
Start with readme.md to understand the purpose and scope of the repository with a table of content
Read the two high-level docs to get an overview
Read an overview of integrating APIM with Stripe (i.e., What is Stripe, how Stripe's product map to APIM product, architecture diagram, consumer flow)
Ready to deploy the sample, read and complete the pre-requisites
Follow instructions to deploy the project
In readme.md
I suggest providing a full table of contents with purpose of each doc and where to start
In the diagram, I suggest change "App Service" to "Billing App" or "Custom Billing App" to be consistent with other diagrams
I would suggest moving pre-requisite to stripe-deploy and adyen-deploy to make readme.md concise - readme.md can just cover the purpose of the repo, table of contents. We already have a pre-requisite section in those docs.
Adyen and Stripe docs
It's unclear what are "pricing model" vs "revenue model". Are they APIM products vs Stripe products? The explanations in the doc did not help.
deployment-details.md
This doc is in the repo but not referred from any other doc.
advanced-steps.md
The doc says "If you want to make modifications to the infrastructure templates, you will need to run a build script in order to generate a new ARM template output for deployment." - I am not sure does the build script generate ARM template for APIM? or the Billing Portal? Please expand a little.
how-APIM-monetisation.md
"Delegation" is a key feature to make the integration possible. I think we should expand on that section a little bit assuming users do not know what "sign up and the subscription stages of the process" means at this point. We touched on that topic a little in the "API Consumption" section.
If structure of the repo is updated, then the link in the last sentence of this doc will need to be changed as well.