When a merchant wants to expand their business internationally by adopting local payment methods, they need to be partners in open payment loops, such as their acquirers and payment processors, in order to receive those payments.
These players (schemes, acquirers, issuers) can only be international or local, so you can reach a wider range of customers by hiring a local partner.
These partnerships open up emerging markets such as Latin America, where payment methods reflect a national network, but do not translate well into other markets. A payment processor not only provides a simple payment method but also connects local and international open loop parties with card schemes on behalf of both the merchant and the customer. It can help companies expand their business and start selling online to Latin Americans.