Could I translate this message as the optional text in documentation of("The following field is required")?
That is how I translated it ("The following field is required:") . I am not certain that it is 100% correct, though.
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That is currect - as stated in an earlier topic, IIRC. The code contains "payflowproGatewayErrorMsgJs + currField"
I've translated "The following field is required:" because in Galician "your" could be "o seu" or "a súa" depending on the noun which is next to it.