In addition to manual configuration and configuration via RESTCONF, OpenDaylight provides an alternative way of BGP provisioning using OpenConfig.
OpenConfig is an initiative to define vendor-neutral data models to allow seamless network management and configuration. An RFC draft that defines a YANG data model for BGP is implemented by OpenDaylight's BGP project in order to support this (https://tools.ietf.org/html/draft-ietf-idr-bgp-model-00).