Remittance license is a common, informal name for a money transfer license: the authorization a business must hold before it accepts money from the public and delivers it to someone else, particularly across borders. The main entry describes the requirements, including capital, safeguarding of customer funds, fit and proper owners and an anti-money laundering program.
Few laws use the phrase itself. Each jurisdiction has its own category. In the United States the equivalent is a state money transmitter license together with federal MSB registration. In the European Union and the United Kingdom, money remittance is a payment service that requires authorization or registration as a payment institution. Some countries do use the word directly: Singapore, for example, formerly issued a remittance licence before folding the activity into its payment services regime, and several Asian and Gulf regulators license remittance or exchange houses as a distinct class.
People searching for a remittance license are usually asking what permission is needed to run a remittance business in a given country, or whether they can operate as an agent of an existing license holder instead. The answer depends on both the sending and the receiving jurisdiction.