client.js

        schema: {
          pmcid:   Joi.number().required(),
          siteid:  Joi.number().required(),
          prospects: Joi.array().min(1).required().includes(Joi.object().keys({
            Prospect: Joi.object().required().keys({
              email:      Joi.string().required(),
              firstname:  Joi.string().required(),
              lastname:   Joi.string().required(),
              numbers: Joi.object().optional().keys({
                phonenumbers: Joi.array().required().includes(Joi.object().keys({
                  PhoneNumber: Joi.object().keys({
                    number: Joi.number().required()
                  })
                }))
              })
            })
          }))
        }