Your Cart

    Is this your street address?


    ···· ···· ···· 4242
    Test card



    Use a different card?


    pp paypal

    or pay with

    We do not keep any of your sensitive credit card information on file with us unless you ask us to after this purchase is complete.

    or pay with

    Please confirm your location:
    You'll be charged .

    Your purchase was successful!

    We charged your card and sent you a receipt

      Gumroad Library

      Download from the App Store or text yourself a link to the app

      Oscar Javier

      Arquitecto de software & Full Stack Developer. Apasionado por las tecnologías, emprendedor e innovador. Autor del libro Introducción a los patrones de diseño.

      Follow for updates on what Oscar Javier is creating.

      Powered by Gumroad