Hello There
The Costa Rican Visa isnt very difficult to obtain.
First off if the Dominican has a Valid /USCanadian/European Visa Or Permanent Resident Status he wont need a Costa Rica Visa for stays up to 90 days.
If they dont have any of the mentioned above they will need a Costa Rican Visa.In order for this Visa to be issued
Requirements to obtain visa
1.A passport valid for at least 6 months (and photocopy of the page with information).
2.An application form. This is an official document, therefore only application forms issued at Consulates .
3.A request letter addressed to Direcci?n General de Migraci?n y Extranjer?a. This letter will only be valid if faxed by the Consulate that will issue your visa. The immigration office does not process documents that are not presented by the Consulate of your jurisdiction.
4.1 color photograph (2 x 2 inches).
5. A round trip / ongoing flight itinerary within 30 days. It is recommended NOT to buy your airline ticket until your visa has been approved, but you must show a flight reservation with your name on it.
6. A personal or company letter stating the purpose of your trip. If you have been invited by the government or a public or private institution, request a letter in Spanish addressed to the Direcci?n General de Migraci?n y Extranjer?a
7. Proof of solid economic status (bank account statements, salary statements, etc.)
The Visa take between 3 to 10 business days to be issued
Once the visa is issued and stamped in the passport the person must enter Costa Rica within 2 months.
The Visa fee is about $15usd
Good Luck!