According to an example, with respect to a pluggable control system for fallback website access, a metric associated with operation of a primary interface may be ascertained for the primary interface that is configured to provide a third-party provider access to a website. The metric may be compared to a metric threshold. Based on a determination that the metric exceeds the metric threshold, an indication of a failure associated with the primary interface may be generated, and the access of the third-party provider may be switched from the primary interface to a fallback interface. Based on a determination that the metric is less than or equal to the corresponding metric threshold, the access of the third-party provider may be maintained using the primary interface. Further, operations between the third-party provider and the website may be controlled using the accessed primary interface or the accessed fallback interface.