nakopay (Ruby gem)

require "nakopay"

NakoPay.api_key = ENV["NAKOPAY_SECRET_KEY"]

invoice = NakoPay::Invoice.create(
  amount:         "19.99",
  currency:       "USD",
  coin:           "BTC",
  description:    "Pro plan",
  customer_email: "alex@acme.com",
  idempotency_key: "ord_1042",
)

puts invoice.id, invoice.checkout_url

post "/webhook" do
  payload = request.body.read
  begin
    event = NakoPay::Webhook.construct_event(
      payload,
      request.env["HTTP_X_NAKOPAY_SIGNATURE"],
      ENV.fetch("NAKOPAY_WEBHOOK_SECRET"),
    )
  rescue NakoPay::SignatureVerificationError
    halt 400
  end

  fulfill(event["data"]["object"]) if event["type"] == "invoice.paid"
  status 200
end