@lester, for a wireless link over a distance of 700 meters you would use a directional link, e.g. two Pharos CPEs in a PtP setup.

You could also use Tenda devices if they offer similar PtP CPEs which provide such a range.

However, to offer Omada voucher services at the remote location I recommend to connect another EAP110 or EAP225 to the remote CPE and integrate the local CPE into your network running the Omada controller. A wireless link directly from the local CPE to the EAP110's WLAN would be error-prone and unreliable.