1)  Do I required SSL certifications?
Ans:   Yes, You do have required SSL, If you face any error regarding SSL certifications then
you must reach out to your hosting company to resolve this.

2)  Does this plugin is secure?
Ans:   Yes, it is.

3)  Does plugin store any transcation informations?
Ans:   No, plugin is mediator between your website and Quickbook, It direct send all the
informations to quickbooks hence plugin does not store any transcation informations.

4)  Do I need quickbook merchant account?
Ans:   Yes, you do required merchant account.