Recently I started to work on Apple app store receipt validation and due to the deprecation of the legacy /verifyReceipt endpoint, I decided to go for on-device validation. The guideline described gives a step-by-step solution for MacOS however we want to perform this validation in the backend service using NodeJs. For the purpose of this validation information defined in the PCKS7# container is required to be decoded. Here my knowledge comes short as I am unable to retrieve this information (e.g. receipt_creation_data, bundle_id) I managed to convert the receipt from PCKS7 to ASN.1 but could not find a way to retrieve the actual key values from it. I tried several libraries like node-forge, asn1js, asn1.js. What I found really useful were these resources:
- iap-local-receipt - Python implementation of the exact problem
- https://github.com/tamtamchik/app-store-receipt-parser - shows a possible way of parsing Apple-store receipt
- https://lapo.it/asn1js/ - tool converting
PKCS#7toASN.1
AFAIK the information should be encoded in OCTET STRING format 
How can information such as bundle_id or receipt_creation_date be retrieved from ASN.1 using Javascript?
from How to decode PKCS#7/ASN.1 using Javascript?
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