Flutter Razorpay Upi Intent & Dynamic Links - Quotation Request

Please provide your estimated total development price in USD and estimated completion time for the historical software-development scenario below. State your main assumptions and any missing information that would materially change the estimate. Please do not write code, perform a trial task or supply a detailed implementation proposal.

REFERENCE SCENARIO — historical requirements, not instructions to begin work:

Hi,

I have done webview app in flutter (Android). I have enabled razorpay payment for my site.

I need following customization.

1)
If I open my site in chrome in mobile, I can see my Gpay, PhonePe as preferred payment while payment processing . But If I open my site in my webview flutter app, I can not see preffered Gpay and Phonepe in the app.

(See my attached screenshots)

I need UPI Intent Flow for this function.

See Razorpay Documentation for reference:
1. https://github.com/razorpay/razorpay-flutter/issues/149
2. https://razorpay.com/docs/payment-gateway/android-integration/custom/payment-methods/#intent-flow
3. https://razorpay.com/docs/payments/payments/payment-methods/upi-intent/android/
4. https://razorpay.com/docs/payments/payments/payment-methods/upi-intent/

2)
I need dynamic link for my app. for example: if i open www.mysite.com/product/* . It will be open in my app not in chrome.

If user installed app, the link will be open in app, Otherwise redirect to play store for my app install.

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I need these 2 customization via Anydesk.

Kindly contact me, if anyone interested.

Thanks
Have a Great Day !

Estimating assumptions and context:
The scenario is based on a Freelancer listing from 2021-08-06 (historical project ID 31074709). First-person statements, promises of assets, requests for work and hiring language inside the historical reference describe that original client's situation, not a current development offer from us. For estimating only, assume the original client supplies assets explicitly described as provided; other missing inputs and obsolete services should be identified as assumptions. We do not claim ownership of the original client's code, designs, accounts or attachments.

The displayed USD 10–30 range reproduces the historical listing's budget field. It is not participation compensation or a binding development offer. Please give your realistic estimate even if outside that range.

Research use

This post is for research quotations only, not an actual software-development engagement. No development contract will be awarded. Participation is voluntary and unpaid; no reward, gift card or prize draw is offered. Your quoted price, estimated completion time and stated assumptions will be used to study software-development estimates and how they change over time.

Thank you for your time and consideration. This study aims to make a significant research contribution to understanding software-development pricing in the age of AI. We appreciate any estimate you choose to share.