EPF - What are the mandatory contributions that an International Worker should make?

Hello All,
Wondering if you could help me in with a clarification with regards to EPF contributions for an IW.
Any government links is deeply appreciated
1. What are the mandatory contributions that an IW should make? And the same for an employer?
2. Online forums indicate it as 12% - what is the actual value ?
3. is this 12% of the overall pay (including all allowances) or only basic and DA. For e.g. if CTC is 10000 (with Basic - 5000, DA - 1000, other allowances - 4000 ) what should be PF contributions by both IW employee and employer?
4. Is the employer contribution a part of the employee salary? If yes, that effectively means 24% from the employee's pocket is locked into PF
5. When can this amount be withdrawn?
Any government links is deeply appreciated
Looking forward to hear a response
Thanks in advance!
Regards

PF for IW is complex to understand. The contributions for IW are @ 12% of gross wages with matching contributions fro employer. How you internally treat this is a different issue.
The IW from countries with whom India has signed social security agreement (SSA) will be able to withdraw amount when they leave India, rest will get it on attaining age of 58.