Need to fully integrate a custom WP membership site with ccBill using ccBill's postback capabilities (equivalent to IPN - the site was configured with an IPN-type processor that does not continue to support our website)
The site has three types of membership but members can upgrade and/or buy instant features that expire after some time and that's why we need to use ccbill postback.
Bidders please be prepared to show proficiency working with ccBill. Deep WordPress knowledge is a MUST!