Details on visa applications may be found in these useful links:
Once you have paid for the CONMEDIA 2019 conference registration, we will issue you an official invitation letter with official STAMP to assist you to obtain a visa to Indonesia. In this case would you please provide the following information and send to our official email (firstname.lastname@example.org).
1. Full Name (exactly as in your passport)
2. Scanned Passport
3. The dates you expect to arrive and depart Indonesia
4. Name of the CITY you will apply to for a Indonesian visa.
You can use the letter to get a visa in the nearest Indonesian Embassy/Consulate.