in src/main/scala/pa/PaClient.scala [110:113]
def playerHead2Head(player1Id: String, player2Id: String, startDate: LocalDate, endDate: LocalDate, competitionId: String)(implicit context: ExecutionContext): Future[(Head2Head, Head2Head)] = {
val (startDateStr, endDateStr) = formatDates(startDate, endDate)
get(s"/player/headToHeads/$apiKey/$player1Id/$player2Id/$startDateStr/$endDateStr/$competitionId").map(interceptErrors).map(parsePlayerHead2Head)
}