Card Change on HCE-based contactless payment

Hi,

I am integrating the HCE-based API into our SDK.

Ideal flow

It is bit tricky to support card change (step 3 below) after field-detect/double click due to NFC action sheet. Ideally, the flow is:

1. User double-click.
2. App launch
3. "Hold near Reader" NFC instruction
4. (optional) User change card
5. User tap device to POS reader
6. payment succeed.

Approach A

If I follow the code snippet in CardSession, where it calls startEmulation after readerDetected, I could change card before that. However, the "Hold near Reader" NFC instruction is shown very late, during tap.

1. User double-click
2. App launch
3. (optional)User change card
4. User tap device to POS reader
5. "Hold near Reader" NFC instruction
6. payment succeed.

Approach B

If I call startEmulation after sessionStarted, I could show "Hold near Reader" NFC. However, I could not provide the optional capability to change card anymore.

1. User double-click
2. App launch
3. "Hold near Reader" NFC instruction
4. User tap device to POS reader
5. payment succeed.

Neither approach A or B provide optimal approach shown in Ideal flow.

Is this expected from CardSession that there is no option to startEmulation without the action sheet?

Is there a plan to improve startEmulation so that it could show "Hold near Reader" without the action sheet?

Thank you.