Javascript insertion

Live Chat Anytime provide chatbots for businesses. Chat bots require 12 lines of Javascript inserting just before the closing body tag in the website footer. I am looking for an individual who can insert this code on behalf of our clients and ourselves. Initially it won't be many and it won't be often but as the company grows the amount and frequency will increase. The individual will be provided with our clients website details and most be competent to install the code without risking compromise of our clients website. We would like to pay on a per insertion basis. of just a few dollars. If the individual has website design and build experience there may be the opportunity of capturing clients who require build services and so i am looking for an individual who would be happy to work on a partnership basis as far as website design and build is concerned we may also in time pick up SEO work as well and the same partnership basis would apply.