intergrate membership plugin with the theme registration process

It has a theme that does shipping service functions between transporter and owner. Similar to [login to view URL] but our one will be only for horse transport around Europe. It has most of the features desired, but few are missing. We need you to help us integrate membership plugin with the theme registration process, so when transporter registers they will pay a membership fee and they won't be allowed on the restricted area of the site or bid on the transport jobs if they don't have an active membership. Each transporter and owner will have to have a separate registration fields, but only transporter will be paying membership subscription fee. MY SUGGESTION IS TO USE FOLLOWING PLUGIN [login to view URL] With the following addon for custom fields [login to view URL] Plugin will be provided to you unless you have better plan My suggestion to use this plugin is because it has the ability to set up a discount on the first time subscription which I will need. For instance, first time subscribers will be paying 50 euro for 6 months and next 6 months will cost 100 euros)