What are the visa & residency requirements in El Salvador?

"In order to visit El Salvador, 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 proof of sufficient funds to cover the duration of the stay. Depending on the purpose of the visit, additional documents may be required. In order to obtain residency in El Salvador, foreign nationals must submit an application form, a valid passport, a passport-sized photograph, proof of sufficient funds to cover the duration of the stay, and a criminal background check. Depending on the purpose of the residency, additional documents may be required. The application process may also involve an interview with a consular officer. Once the application is approved, the foreign national will receive a residency card, which must be renewed every two years," said another expat in El Salvador.