American Express Authorization and Capture Options {#um-models-flows-amex-payg-auth-capture}
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There are two options for handling American Express PAYG authorizations and captures. Implement the option that suits your business model.

> IMPORTANT  
> American Express requires your payment technology partner (PTP) to support nominal and full value authorizations during the Level 3 certification.

1. Send an authorization request for a nominal amount.
2. During the travel period, collect the rider's tap data to calculate the aggregated fare.
3. Choose the request to send:
   * **Option 1:** When the floor limit is reached, send a capture request to collect the accumulated amount.
   * **Option 2:** When the number of trips exceeds the floor limit, send a delayed online authorization request.
4. After receiving a successful response, return to step 1 to handle subsequent trips and journeys.