Aloha Jacqui,
My name is Erik, and I have been doing Divi Theme WordPress Websites, SEO and Speed Performance for more than 10 years. I am a Divi Developer, and my specialty is making Google happy! My bid might not be the lowest bid, but I do this stuff every day and have great results!
1. SEO. I looked at your site and there are a lot of things we could do to improve your Organic Search Traffic. Most importantly, the page loading speed. We can optimize the images on your website and incorporate several speed-increasing methods that would greatly improve your site's page authority with Google. This is where the most amount of value will be for the work I can perform for you.
2. Payment Gateways. Paypal and Stripe are your best bet. We can use Gravity Forms Plugin (I am a GF licensed developer, no need to purchase) to create forms for each of your 'products' or 'services'. You can even set up recurring annual or monthly payment in this manner. I currently have this setup on my site. Depending on how many forms you need, this is fairly simple. This bid comes with one or two, but they are easy to replicate to create additional forms (for each different product or service).
3. ConverKit does integrate with WordPress. Should be a simple script or plugin. We can do this.
I can start work immediately. I'm in Californian, and I guarantee my work. After this project, I can also help you with your website's SEO / content strategy (consulting).
Thank you.
Erik Blair