Shell script to sign a Stripe webhook event

sign-stripe-webhook-request.sh

#!/usr/bin/env bash
WEBHOOK_DESTINATION="http://localhost:3000/stripe/webhook"
WEBHOOK_SECRET="whsec_ENTER_YOURS_HERE"

if [[ ! "$#" -eq 1 ]]; then
	echo "USAGE: $0 /path/to/event.json";
	exit 1;
fi

timestamp="$(date +%s)."
echo -n $timestamp > sign.tmp
cat $1 >> sign.tmp

signature="$(cat sign.tmp | openssl dgst -hmac "$WEBHOOK_SECRET" -sha256)"

curl "$WEBHOOK_DESTINATION" \
-H "Stripe-Signature: t=$timestamp,v1=$signature" \
-H "Content-Type: application/json" \
--data-binary @"$1"