What are the visa & residency requirements in Dominican Rep?

"In order to visit the Dominican Republic, foreign nationals must obtain a visa prior to their arrival. The process of applying for a visa involves submitting an application form, a valid passport, a passport-sized photograph, and the applicable visa fee. Depending on the purpose of the visit, additional documents may be required. In order to obtain residency in the Dominican Republic, foreign nationals must submit an application form, a valid passport, a passport-sized photograph, and the applicable residency fee. Depending on the purpose of the residency, additional documents may be required. The application process also involves an interview with a Dominican immigration official. Once the application is approved, the foreign national will receive a residency card, which must be renewed every two years," said another expat in Dominican Rep.