Simple payment script

#!/bin/bash -e

if [[ $# != 3 ]]; then
   echo "usage: pay SENDER-SECRET-KEY BENEFICIARY-ADDRESS AMOUNT" >&2
   exit 2
fi

SK="$1"
DEST="$2"
AMOUNT="$3"

if ! SENDER=$(echo "$SK" | stc -pub); then
   echo "invalid sender secret key" >&2
   exit 2
fi

TMP=`mktemp pay.XXXXXXXXXX`
trap "rm -f '$TMP'" 0

stc -o $TMP - <<EOF
tx.sourceAccount: $SENDER
tx.operations.len: 1
tx.operations[0].body.type: PAYMENT
tx.operations[0].body.paymentOp.destination: $DEST
tx.operations[0].body.paymentOp.amount: $AMOUNT
EOF

echo $SK | stc -i -sign $TMP

stc -post $TMP