A: es—doable with CardClan + your ecommerce + automation glue. CardClan doesn’t natively run a paid marketplace with client self-signup, but you can deliver it with WooCommerce/Shopify + Zapier/Pabbly/Make and CardClan’s existing features (workspaces, white-label links, automations).

Here’s the clean way to build it:

What works out-of-the-box with CardClan
• Workspaces & roles (one per client or per brand). You invite users to a workspace; they can create/send cards under your branding. 
• White-label links (e.g., greetings.yourdomain.com) so every purchased e-card lives on your domain. 
• Automations via Zapier/Pabbly (trigger: a purchase or form → action: create/send a card using Card ID + Zapier Key). 

Two architectures (pick one)

A) “Self-service editor” (client logs into CardClan)

Flow
1. Customer pays on your site (Woo/Shopify).
2. Automation posts a task for your team to invite the buyer to a dedicated workspace (best practice: 1 workspace per client).
3. Client logs into CardClan and creates/tracks their cards directly (CardClan UI).
4. All links are on your white-label subdomain; sends go via your SMTP.  

Pros: true self-service editing; you keep CardClan analytics.
Cons: Inviting users is a dashboard action (docs don’t show a public API for auto-provisioning seats), so you’ll likely semi-automate: order → task → admin invite.

B) “Managed portal” (client stays on your website)

Flow
1. Customer pays → sees a “Create your e-card” form in your client area.
2. Submission triggers Zapier/Pabbly to create/send the card in CardClan using Zapier Key + Card ID, mapped to the buyer’s name/email/occasion. 
3. You show the card link + status in your portal (store your own status flags; CardClan hosts the card).
4. Optional: include the card link in your Woo/Shopify order emails; add a resend or duplicate button that re-triggers the Zap.

Pros: fully automated, no CardClan login required for buyers.
Cons: Editing happens through your forms (you push updates to CardClan via automations), not inside CardClan’s editor.

Payments, access, and tracking
• Payments: handled by Woo/Shopify. Use order webhooks as triggers.
• Access:
• Self-service model → invite buyers to a workspace (dashboard action). 
• Managed model → no CardClan account; you generate cards for them via automation. 
• Tracking/analytics: CardClan provides engagement on the card link; you can email reports to clients or mirror basic statuses in your portal.

Practical build checklist
1. White-label your domain in CardClan (CNAME → ssl.cardcla.me). 
2. Connect SMTP (Gmail app password or M365 Auth SMTP) so sends come from your domain.  
3. Create master templates (business card, thank-you, welcome).
4. In CardClan → Generate Zapier Key, note your Card ID(s). 
5. In Woo/Shopify → webhook/Zap: order paid → CardClan action (create/send card) → return/share link to client. 
6. (Self-service) Add an internal step to invite the customer to their workspace.
7. Add SPF/DKIM on your domain for deliverability. 

Known limits & workarounds
• No documented self-serve SSO/user provisioning API → use admin invites (self-service model) or run managed flows (portal model). 
• SMS/WhatsApp not native → add Twilio/WATI/Zoho step to send the card link by text. (Works great.) 

If you tell me which store you use (Woo or Shopify) and which model you prefer (Self-service vs Managed), I’ll ship you:
• a ready-to-import Zapier recipe,
• the order-paid webhook mapping, and
• a “digital business card” template with CTA buttons + QR code.