I took the following document as an example and performed a payment simulation with the BKM normal integration method on ASP.NET Core Document : https://test-api.bkmexpress.com.tr/docs
Note While working in local, I recommend using the ngrok application to export requests to Instalments and Nonce service urls.
Ngrok Download Link : https://ngrok.com/download Ngrok Sample Usage on Ngrok CLI : ngrok http 53809 -host-header="localhost:53809"