Cheltenham Rare Books review for Click & Drop

It was working perfectly for several years and suddenly, about a month or 2 ago stopped feeding the tracking numbers back to shopify from royal mail. also I was getting duplicate orders coming through to royal mail and after exploring noticed that there were 8 connections from shopify to royal mail. Every time I'd tried to update the integration it formed a new connection. What a shame. It was a great app but for some reason has been spoilt.