Getting access to urgent care can be a bit of a challenge. Start with doing an internet search for the country you are in:  “how get urgent care appointment in germany”. This will bring up options that are available to you. Each country may be different so you will need to search for the specific one you are in.

If you cannot use a telehealth session and need to see a doctor in person it is better to utilize the non-emergency medical phone number if it is available. If they determine you should see a doctor they can provide you with an appointment at an urgent care facility which is better than going there and waiting for an opening. 

You will pay the urgent care doctor directly. Some take credit cards, some only cash. Make sure to ask before you go so that you are able to pay for your treatment before you leave. We have been to urgent care in France and in Germany and the cost for seeing the doctor was 75-120 euros. They provided a paper prescription which we took to the pharmacy.