In this sentence:
Si se lo merecen
What is the role of "se" and "lo"?
Direct object and indirect object?
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The pronoun "lo" (not to be confused with the article "lo", e.g.: "Lo esencial es invisible a los ojos") is almost always the direct object wherever it appears (some use "lo" as an indirect object. This is called "loísmo". "Loísmo" is very uncommon, and usually considered wrong).
As for "se", it is usually an indirect object, but some verbs, called pronominal verbs, require "se" (and "me", "te", "nos" and "os") as particles without any real meaning. These pronouns are usually considered to be part of the verb in this case. "Merecer" is typically used as a pronominal verb in informal settings, as is the case here. However, you can drop the "se" with no change in meaning: "si lo merecen".