This is an update to older posts claiming you need separate or combined tickets costing up to €10 to travel from central Paris to Disneyland.
We traveled from Gambetta and asked at a ticket office, where we were told a single €2.55 metro ticket was enough. This contradicted what we had previously read online.
We then went to Nation station, took the RER A, had our tickets checked, and everything worked fine.
In short, a single €2.55 metro ticket appears to be sufficient for getting to Disneyland from central Paris, and this is also supported by what I found online.
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