I have an app in the app store that I have added an in app purchase for, I fully tested it in the sandbox environment and all worked fine. I have had the app update and the in app purchase approved by apple and according to iTunes connect all has gone live. The app updates just fine but then in app purchase simply doesn't work!! No products are returned! Anyone else have this problem? Surely if it worked in the sandbox and apple has approved it, there should be no issues!?
As I understand it, no - all the things you want to sell via in-app purchase run through a vetting process similar to that of the apps themselves. Apple won't allow, for example, a "photo of the day" application if you can in-app purchase pornographic photos to be sent to you daily.
What you could probably do is submit your app with a backlog of in-app purchases, five or six days ahead of time, then consistently be submitting your daily items ahead of when you want them to be available. Not sure how reliable the review process is, or whether this will work for your situation - just a thought.
UPDATE: Using HTTPS is now exempt from the ERN as of late September, 2016
Unfortunately, I believe that your app "contains encryption" in terms of US BIS even if you just use HTTPS (if your app is not an exception included in question 2).
Quote from FAQ on iTunes Connect:
"How do I know if I can follow the Exporter Registration and Reporting (ERN) process?
If your app uses, accesses, implements or incorporates industry standard encryption algorithms for purposes other than those listed as exemptions under question 2, you need to submit for an ERN authorization. Examples of standard encryption are: AES, SSL, https. This authorization requires that you submit an annual report to two U.S. Government agencies with information about your app every January. "
"2nd Question: Does your product qualify for any exemptions provided under category 5 part 2?
There are several exemptions available in US export regulations under Category 5 Part 2 (Information Security & Encryption regulations) for applications and software that use, access, implement or incorporate encryption.
All liabilities associated with misinterpretation of the export regulations or claiming exemption inaccurately are borne by owners and developers of the apps.
You can answer “YES” to the question if you meet any of the following criteria:
(i) if you determine that your app is not classified under Category 5, Part 2 of the EAR based on the guidance provided by BIS at encryption question. The Statement of Understanding for medical equipment in Supplement No. 3 to Part 774 of the EAR can be accessed at Electronic Code of Federal Regulations site. Please visit the Question #15 in the FAQ section of the encryption page for sample items BIS has listed that can claim Note 4 exemptions.
(ii) your app uses, accesses, implements or incorporates encryption for authentication only
(iii) your app uses, accesses, implements or incorporates encryption with key lengths not exceeding 56 bits symmetric, 512 bits asymmetric and/or 112 bit elliptic curve
(iv) your app is a mass market product with key lengths not exceeding 64 bits symmetric, or if no symmetric algorithms, not exceeding 768 bits asymmetric and/or 128 bits elliptic curve.
Please review Note 3 in Category 5 Part 2 to understand the criteria for mass market definition.
(v) your app is specially designed and limited for banking use or ‘money transactions.’ The term ‘money transactions’ includes the collection and settlement of fares or credit functions.
(vi) the source code of your app is “publicly available”, your app distributed at free of cost to general public, and you have met the notification requirements provided under 740.13.(e).
Please visit encryption web page in case you need further help in determining if your app qualifies for any exemptions.
If you believe that your app qualifies for an exemption, please answer “YES” to the question."