商家私钥

ALIPAY_RSA_PRIVATE_KEY = <<-EOF
-----BEGIN RSA PRIVATE KEY-----
这里是生成的商家私钥，旧版支付接口只能支持RSA（1024长度）
-----END RSA PRIVATE KEY-----
EOF

Helper Method Config

拼接参数

def generate_alipay_params(options = {})
  base_params = {
    "service" => "mobile.securitypay.pay",
    "_input_charset" => "utf-8",
    "partner" => "2088121210025141",
    "seller_id" => "2088121210025141",
    "payment_type" => "1"
  }
  pay_params = base_params.merge(options)
  pay_params.merge({ "sign" => CGI.escape(Order.alipay_sign(pay_params)), "sign_type" => "RSA"})
end

签名

def alipay_sign(params)
  string = params.map { |k, v| %Q{#{k}="#{v}"} }.join('&')
  rsa = OpenSSL::PKey::RSA.new(ALIPAY_RSA_PRIVATE_KEY)
  Base64.strict_encode64(rsa.sign('sha1', string))
end

Action: Use Helper Method

        pay_params = generate_alipay_params({
          "out_trade_no" => "test_no_01",
          "notify_url" => "https://example.com/notify",
          "subject" => "test",
          "total_fee" => "0.01",
          "body" => "test"
        })
        pay_string = pay_params.map { |k, v| %Q{#{k}="#{v}"} }.join('&')
        pay_string = URI.encode(pay_params.map{|k,v| %Q{#{k}="#{v}"}}.join("&"))   # 这一步根据用户需要执行

后面找时间加上新版接口