PDF Download button on Certificate of Completion

I have developed a compliance training course for a 'not for profile' organisation. Throughout the year the organisation needs to recruit volunteers to assist with their work.

All volunteers need to register and complete the compliance training in advance of attending a one day hands-on program.

The course has been designed with variables that capture the volunteer's name, email address and pass score on the certificate slide.

The organisation doesn't have use an LMS for tracking and would prefer that volunteers can click a 'down load to PDF button' on the certificate to be able to email this PDF directly to the organisation. 

I am new to Articulate and java script and have read dozens of eLearning Hero responses re similar topics  requests however, I cannot find one that addresses my client's requirements in terms I understand. Apologies if this has already been addressed but I am seeking someones assistance in this space.

Many thanks in advance