[RFB] Appointment booking block #201

Request For Block (RFB)

Given a set of availability rules, dates or a calendar allow end users of a block to book events on an external calendar inline wherever this block is embedded. The target cal/source to check availability via would be editable when viewing the block in edit-mode. When in view-only mode, users should be constrained to making bookings only.

Could additionally support Cal.com/Calendly/equivalent services via their APIs where available, rather than requiring embedding apps to integrate with calendar sources directly, or block embedders to configure direct connections via a block's settings.

🚀 Potential future extensions

• Resource-linked appointment bookings where calendar availability is not the only constraining factor (i.e. things like inventory or room availability can be taken into account through simple logical operators - or something like ownership of a specific NFT, which Cal enables)
• Optional payment processing inline, as afforded by Calendly's Stripe integration, services like Square Appointments

🎨 Existing tools and prior art

• Calendly
• Cal - available under AGPL this could potentially be wrapped? 🤔 UK-based, too, and also super open. Founders: @baileypumfleet @PeerRich -- aligned thesis and goals?
• Fantastical Scheduling