Please use this link to apply online : https://sin-nas.canada.ca/en/Sin/You can do online for sin.
I received mine in 1 week. You would need soft copy of the following documents :
1. Proof of status in Canada - COPR
2. Proof of Identity - Passport Bio page
3. Proof of Address : Lease agreement/Utility bill/Bank statement/Any letter from Federal or Provincial govt.
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