Hello Ray,

I have checked this issue at your site and found your template is conflicting with bootstrap toggle.
I have tried to check it with default joomla template and it's working fine. As you said you some customization done in admin template, can you please ask your template provider for this issue.

Your site FTP Details are not working.
Regarding your issue with paypal. This issue is coming invalid receiver email.It seems paypal code not updated with latest one.
To resolve this issue, refer below mentioned line of code.
Go to root/plugins/payplans/paypal/paypal/app/paypal/paypal.php, near line no. 147 find below mentioned line of code.

if($merchant_email != urlencode($data['business'])) {

Replace with

if($merchant_email != urldecode($data['business'])) {

After doing this change try to complete one more payment and update us if still issue persist.

Thanks you. Especially for pointing out the jQuery issue. Is there anyway you could advise me on how to try including a noconflict statement within the Payplans backend to solve this issue myself?

Hello,

You need to remove hide class whenever you click on [+] symbol.
In Payplans we are using bootstrap for toggle. See attached screen shot. As you have already

you can find this template code on below mentioned path.
root/administrator/components/com_payplans/templates/default/config/default_edit_settings.php
see attached screen shot.

Let me know if you have any query.