The cost will depend on the client's requirements. If the client has very small business transactions, then we can reduce the cost. If the client wants it to be more secure, then the cost will be very high based on the transactions, requirements, and security policies.

The solution is worth the cost.

I am not familiar with the platform's pricing details. However, based on the knowledge, it is relatively cheaper than Azure Identity Services and cloud services in general.

BizTalk Server is cheap. I would rate its pricing a two out of five. 

Pricing and licensing is reasonable.

The pricing and licensing structure is excellent.