Api vault invest request

Request payload for investing in a vault.

This API allows a client to invest a specified amount of tokens in a particular vault.

Name `Lite`	Type	Required `Default`	Description
vault_id `vi`	string	True	The unique identifier of the vault to invest in.
currency `c`	string	True	The currency used for the investment. This should be the vault's quote currency.
num_tokens `nt`	string	True	The investment sum, in terms of the token currency specified (i.e., `numTokens` of '1000' with `tokenCurrency` of 'USDT' denotes investment of 1,000 USDT).
signature `s`	Signature	True	The digital signature from the investing account. This signature must be generated by the main account ID and is used to verify the authenticity of the request. The signature must comply with AccountPermExternalTransfer permission.

Name `Lite`	Type	Required `Default`	Description
signer `s`	string	True	The address (public key) of the wallet signing the payload
r `r`	string	True	Signature R
s `s1`	string	True	Signature S
v `v`	integer	True	Signature V
expiration `e`	string	True	Timestamp after which this signature expires, expressed in unix nanoseconds. Must be capped at 30 days
nonce `n`	integer	True	Users can randomly generate this value, used as a signature deconflicting key. ie. You can send the same exact instruction twice with different nonces. When the same nonce is used, the same payload will generate the same signature. Our system will consider the payload a duplicate, and ignore it. Range: 0 to 4,294,967,295 (uint32)
chain_id `ci`	string	True	Chain ID used in EIP-712 domain. Zero value fallbacks to GRVT Chain ID.