In-app purchase of ios platform in React-native App - 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:

Hello, React native experts. I need only in-app purchases in the react-native app IOS platform. ​My app is live on google, apple store now, use stripe for membership.
I want only to replace the in-app purchase function instead of stripe payment in the ios platform of react-native.

- Delivery condition
1. add in-app purchase function instead of stripe in the membership page.
2. Need to the payment re-occurring on a monthly basis
2. upload app on test flight for the test. After the test, If works well, the project will complete.
(Apple account will be provided.)

Note:
Only if you have experience in react-native ios in-app purchase, please bid estimated hours, correct budget, previous URL with in-app purchase. If not, ignore all bids.

Thanks.

Estimating assumptions and context:
The scenario is based on a Freelancer listing from 2021-03-31 (historical project ID 29740375). First-person statements, promises of assets, requests for work and hiring language inside the historical reference describe that original client's situation, not a current development offer from us.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 70–100 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.