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Hello @sasudt
Thank you very much for using our plugin.
If you have the currency field fieldname2, and the transaction fee is 1.9% + 0.10, the equation that calculates the fees would be:
PREC(MIN(fieldname2*1.9/100+0.10, fieldname2), 2)
And then, assuming that the field that calculates the fees is the fieldname1, the equation to calculate the amount received by the seller would be:
PREC(ABS(fieldname2-fieldname1), 2)
Best regards.