Firmar Factura XML de SRI

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Hola buenos días observamos su proyecto y podemos ayudarlo a crear un código PHP puro para firmar, ya que hemos trabajado con proyectos similares . Estaríamos necesitando que nos detalle un poco más de su proyecto para poder cubrir todas sus necesidades. Puede observar nuestro portafolio en el perfil de freelancer. En espera de sus comentarios o dudas que tenga al respecto. Desde ya muchas gracias.