| Name | Type | Description | Notes |
|---|---|---|---|
| index | int | Zero-based position of the button in the approved template's buttons. | |
| sub_type | string | The button kind, which decides how the value is sent: copy_code sends it as the coupon_code payload, flow as the flow token, url as the dynamic suffix appended to the button's base URL. | |
| value | string | The value to send (e.g. the Pix copy-and-paste code for a copy_code button). |