saucy/app/controllers/payments_controller.rb

class PaymentsController < ApplicationController
  def show
    @payment = Payment.find(params[:id])
  end

  def callback
    if ENV["IFTHENPAY_AP_KEY"] != params["key"]
      render status: 403, json: { error: "invalid anti phishing key" }
    else
      member = Member.find_by(number: params["id"].to_i)
      payment = IfThenPay
        .payments(params["payment_datetime"])
        .select { |p| p["Id"] == params["id"] }
        .first

      if payment.nil?
        render status: 400, json: { error: "couldn't find payment" }
      else
        # TODO: handle double payments
        contribution_params = {
          eurocents: payment["Valor"],
          payment_method: {
            "MB" => "multibanco",
            "MBWAY" => "mbway"
          }.fetch(params["payment_method"]),
          payment_on: params["payment_datetime"],
          payment_reference: payment["Terminal"],
        }

        success = member.register_contribution(
          contribution_params,
          nil,
          true
        )

        if success
          render json: { ok: "yes" }
        else
          render status: 500, json: { error: "error registering payment" }
        end
      end
    end
  end
end