How to build crowdfunding in Bubble

Go to the Data tab and create a Campaign data type with fields: title (text), description (text), creator (User), goal_amount (number), amount_pledged (number, default 0), end_date (date), image (image), funding_type (Option Set: All-or-nothing, Flexible), and status (Option Set: Active, Funded, Failed, Closed). Then create a PledgeTier data type with fields: campaign (Campaign), name (text, e.g., Early Bird), amount (number), description (text), limit (number), and claimed_count (number, default 0). Finally, create a Pledge data type with fields: campaign (Campaign), backer (User), tier (PledgeTier), amount (number), and stripe_charge_id (text).

Create a page called create-campaign. Add input fields for title, description, goal amount, end date (Date Picker), and image (File Uploader). Add a Dropdown for funding type linked to the Option Set. Add a section for pledge tiers: a Repeating Group showing existing tiers with an Add Tier button that opens a popup form for tier name, amount, description, and limit. The workflow for saving: When Button Create Campaign is clicked — Create a new Campaign with all field values and creator = Current User. For tiers, create them in a separate workflow triggered by the Add Tier popup's save button.

Create a page called campaign with type Campaign. Display the image, title, description, creator name, end date, and funding type. For the progress bar, add two Groups: an outer Group with a fixed width and a colored background, and an inner Group whose width is set to a percentage: Current Page Campaign's amount_pledged / Current Page Campaign's goal_amount * 100 (capped at 100). Above the bar, display the amount pledged, the goal, and the percentage. Add a conditional: When Current date/time > Campaign's end_date, show Campaign Ended instead of the pledge section.

Below the progress bar, add a Repeating Group showing PledgeTiers filtered by the current Campaign. Each cell shows the tier name, amount, description, remaining spots (limit minus claimed_count), and a Back This button. The workflow: When Back This is clicked — Only when Current date/time < Campaign's end_date and (tier's limit is empty or tier's claimed_count < tier's limit). Trigger Stripe Checkout with amount = tier's amount * 100. On payment success: Create a new Pledge with campaign, backer, tier, and amount. Then Make changes to Campaign: amount_pledged = amount_pledged + tier's amount. Make changes to PledgeTier: claimed_count = claimed_count + 1.

Create a backend workflow called check_campaign_deadline with a parameter campaign_id (text). In it: Look up the Campaign by ID. If amount_pledged >= goal_amount, set status to Funded. If amount_pledged < goal_amount and funding_type is All-or-nothing, set status to Failed and trigger refund workflows for each Pledge. If funding_type is Flexible, set status to Funded regardless of amount. Schedule this backend workflow to run at each campaign's end_date using Schedule API workflow when the campaign is created.

Create a my-pledges page showing a Repeating Group of Pledges where backer = Current User, displaying campaign title, tier, amount, and campaign status. Create a campaigns listing page showing all Active campaigns in a Repeating Group sorted by end_date ascending (ending soonest first). Add filter options for funding type and category. Each cell shows the image, title, progress percentage, amount pledged, and days remaining (calculated as Campaign's end_date minus Current date/time in days).