SSL for SaaS Apps

[DavidGSwift]

Shopify are asking the I ensure my plugin (https://shopifyapi.swiftcrm.net/v1/1) is covered by an SSL. I have moved swiftcrm.net to Cloudflare under an SSL, but this still leave me unsure about the Shopify prefix element. Has anyone with experience of this, that could offer a definitive answer?