Why was I unable to install the Subscriptions app on my Shopify store? I was using the Viva Payment gateway and believe this may be the reason for the failed installation.
Viva is not supported for Bold Subscriptions. You must connect an eligible payment gateway. More details on eligible payment gateways can be found here - https://support.boldcommerce.com/hc/en-us/articles/360054884151-Payment-Options-Eligibility-in-Subscriptions-for-Shopify-Checkout.