# Demo: Progress and tiers: Game milestones for a chosen charity

> In any game, the player picks a charity before playing. Each milestone adds 0,25 € from the studio for it; the player sees the real impact and never pays.

One variant of **Progress and tiers**, in Software and apps: 0,25 € every 20 levels for the charity picked before playing, paid by the studio.

A made-up site, tap.your-studio.example, walked through screen by screen with the Charitips API calls the product makes at each step. Rebuild it in your own project to start from a working flow.

The charity choice in this demo is the Charitips [charity selection widget](https://www.charitips.com/docs/widgets/charity_selection.md), a ready-made proposal. Use it whole, use parts of it, or build your own experience from scratch with the API: [List charities](https://www.charitips.com/docs/api-reference/list-charities.md) gives the charities to show, and the calls below carry the chosen `charityId`.

Charitips widget: the charity cards and their profiles. Your own UI, built with the API: the game, its levels, the button that saves the charity and the card that confirms it.

The full guide, with edge cases: https://www.charitips.com/docs/use-cases/progress-and-tiers.md.

**Once, before the first customer:**

- [`POST /v1/charities-selections`](https://www.charitips.com/docs/api-reference/create-charities-selection.md) Create a charities selection: once: the charities you offer, from the catalog

  ```json
  {
    "name": "Level milestones",
    "charityIds": [
      "<charityId>"
    ]
  }
  ```
- [`POST /v1/campaigns`](https://www.charitips.com/docs/api-reference/create-campaign.md) Create a campaign: once: the campaign the donations go to

  ```json
  {
    "name": "Level milestones",
    "charitiesSelectionId": "<charitiesSelectionId>",
    "type": "PERMANENT",
    "amountType": "FREE_AMOUNT"
  }
  ```
- [`POST /v1/campaigns/{campaignId}/activate`](https://www.charitips.com/docs/api-reference/activate-campaign.md) Activate a campaign: once: the campaign starts taking donations

## Screens and calls

### 1. Before the first level

- The customer picks a charity from your selection.
- Button: Choose the charity

No call: this screen only shows the result.

### 2. At the milestone

- Button: Play the next level

**Your server calls:**

- [`POST /v1/donations`](https://www.charitips.com/docs/api-reference/create-donation.md) Create a donation: from your server, when it happens; amount in cents

  ```json
  {
    "campaignId": "<campaignId>",
    "amount": 25,
    "uniqueExternalId": "levels_204118_tier_6",
    "externalId": "player_204118",
    "charityId": "<charityId>"
  }
  ```

Charitips then sends the `donation_create` webhook to your endpoint.

### 3. At the next milestone

- Button: Play the next level

**Your server calls:**

- [`POST /v1/donations`](https://www.charitips.com/docs/api-reference/create-donation.md) Create a donation: from your server, when it happens; amount in cents

  ```json
  {
    "campaignId": "<campaignId>",
    "amount": 25,
    "uniqueExternalId": "levels_204118_tier_7",
    "externalId": "player_204118",
    "charityId": "<charityId>"
  }
  ```

Charitips then sends the `donation_create` webhook to your endpoint.

## Clone it with a coding agent

```prompt
Clone the Charitips demo "Progress and tiers: Game milestones for a chosen charity" into this project. Read https://www.charitips.com/docs/demos/progress/game-milestones.md: it lists each screen and the Charitips API calls behind it. Build the same flow in this codebase, on the sandbox (https://api.sandbox.charitips.com), with my client id and secret read from environment variables, and follow the rules of https://www.charitips.com/docs/skill.md. Make every API call from the server, never from the browser. When it works, show me each call and its response.
```