Function extractFlowContext

extractFlowContext(
source: FlowContextSource,
secret: string,
): FlowContext | null
Validates and extracts flow context from a signed payload string, a web_app_data payload, or an incoming Telegram update.
Parameters
- source: FlowContextSource
- secret: string
Returns FlowContext | null
Example
```
const context = extractFlowContext(update, "secret");
```