withdraw_collateral

Withdraw collateral from a Loopscale loan.

Handler narrative

Load the GLAM state or program account required by the instruction and verify the signer.
Verify that the integration is enabled on the vault and that the caller has the required delegate permission or owner authority.
Validate the instruction-specific policy, then invoke the external protocol with the vault authority where required.
Withdraw collateral from a Loopscale loan. - Permission requirement: `WithdrawCollateral`.

The submitted accounts must match the declared account list, signer requirements, writable requirements, fixed program addresses, and account relationships shown below.
The GLAM state account is the source of truth for owner, enabled integrations, delegate permissions, policies, assets, borrowable assets, timelock settings, mint linkage, and pricing records.
The vault account must be the PDA controlled by the core protocol program and derived conceptually from the state account; instructions use it as the vault authority for SOL, token accounts, and external positions.
The vault integration ACL must enable this integration before the instruction is accepted; that enablement is defined on the GLAM state account.
If the signer is not the owner, the delegate ACL on the GLAM state must contain the exact protocol permission required by this instruction; registering a delegate alone is insufficient.
Instruction-specific destination accounts must satisfy the external protocol's own account model; GLAM validates the accounts it needs for authorization and policy enforcement, then passes the remaining protocol accounts through CPI.
The instruction metadata names `WithdrawCollateral` as the delegate permission for this instruction.

Uses the standard Big Seven account pattern, plus the instruction-specific accounts below.

Account	Role	Description
bs_auth	signer	Fixed program or sysvar account required by this instruction.
loan	writable	External loan account used by the instruction.
borrower_ta	writable	Instruction-specific account supplied by the caller or SDK.
loan_ta	writable	External loan account used by the instruction.
asset_mint	read-only	Token mint account used by the instruction.
associated_token_program	read-only	Standard Solana program account required by the instruction.
event_authority	read-only	Instruction-specific account supplied by the caller or SDK.

Argument	Type	Notes
params	WithdrawCollateralParams	Instruction parameter object; field details are listed below. Fields: `amount: u64`; `collateral_index: u8`; `asset_index_guidance: bytes`; `expected_loan_values: ExpectedLoanValues`; `close_if_eligible: bool`; `withdraw_all: bool`

Enable the Loopscale integration program on the vault integration ACL before Loopscale position actions.
Delegate permission: WithdrawCollateral.

The Loopscale loan must exist; locking and unlocking determine when principal and collateral movements are valid.