[x] Show dismissible notice with link to gateway configuration guide in our docs - link to be displayed if the essential settings (merchant id, api key, payment source code) are not configured but the gateway has been activated: https://cl.ly/2p0y1u2r1h3v.
[x] Show dismissible notice if a Viva Webhooks verification has never been received for the defined settings (merchant id, api key, payment source code). To be displayed only after a successful validation of the gateway creds in the gateway admin settings page: https://cl.ly/2W1n3c1P313m - Message will not be shown once IPN (Webhooks) options are configured from the Viva merchant account settings (see Settings > API Access > Webhooks).