Adjustable parameters

In a React Native app, users manage their own personal limits, and configuration managers change approval settings from their own session. The hooks listed below and PermissionsV2ApprovalCasesAffectedError ship in @getpara/react-native-wallet, so import them from there. When a user must consent again after saving, open the link from getPolicyConsentUrl with your in-app browser. Let people tune parts of a published policy without a new version. Para supports two kinds of adjustment: personal limits, which each user sets on a Request policy, and adjustable approval settings, which your backend or a configuration manager sets on an approval requirement.

Declare both kinds in the policy JSON, test them with a Development key on Para’s beta environment, and publish the policy to production through a production review. Values that users and managers save belong to the environment where they save them.

	Personal limits	Adjustable approval settings
Declared with	`parameter` on a condition	`safeKnobs` on an `approvalRequirement`
Policy type	Request	Guardrail or Request
Set by	Each user, for their own wallet	Your backend, or configuration managers
Applies to	That user’s requests	Every case for the requirement in one authorization scope

Personal limits

A personal limit lets each user pick their own value for an amount in a Request, such as a daily spending cap. Your policy supplies the default, and Para applies the user’s value only to that user’s requests. Personal limits must be turned on for your app. Until they are, saving a policy with a parameter fails with permissions_v2_extension_unavailable. Contact Para if you get that code.

Declare a parameter

Add parameter: { id, label } to a compare or aggregate condition. The condition’s value becomes the default.

{
  "id": "daily-eth-allowance",
  "effect": "allow",
  "actions": ["transfer_native"],
  "when": {
    "kind": "aggregate",
    "fact": "wallet.spend.native",
    "op": "lte",
    "value": "1000000000000000000",
    "window": "24h",
    "parameter": { "id": "daily-eth", "label": "Daily ETH limit" }
  }
}

compare conditions can use request.value.baseUnits or request.token.value.baseUnits. aggregate conditions can use any metered spend fact, such as wallet.spend.native or safe.spend.native.
allow rules use lt or lte. require_approval rules use gt or gte.
A parameter cannot sit inside not, and each id must be unique in the policy.
Values are amounts in base units, written as integer strings without leading zeros.

Para does not bound personal values. A user can save any amount, including one higher than your default. Use a parameter only where any value the user chooses is acceptable to you.

A Guardrail can also carry a parameter, but no user can change it, so Para always enforces the default.

How users set their limits

The Portal consent screen shows an input for each parameter, labelled with the parameter’s label, with the default as its placeholder and a base units suffix. Values the user enters there are saved with their consent.

Para Portal consent screen for a Request with an input for a personal limit in base units

To build your own settings screen, use the SDK.

Read and update limits from the SDK

getUserPolicyParameters(policyId) returns the user’s current values together with the parameters the policy declares. Pass its policyVersion, policyHash and revision back when you save:

const settings = await para.getUserPolicyParameters(policyId);

if (settings.status === "ready") {
  await para.updateUserPolicyParameters(policyId, {
    policyVersion: settings.policyVersion,
    policyHash: settings.policyHash,
    expectedRevision: settings.revision,
    values: { "daily-eth": "500000000000000000" },
  });
}

Method	Hook	Use
`listUserAdjustablePolicies()`	`useUserAdjustablePolicies`	Policies where the user can set limits
`getUserPolicyParameters(policyId)`	`useUserPolicyParameters`	Current values, defaults and status
`updateUserPolicyParameters(policyId, body)`	`useUpdateUserPolicyParameters`	Save values
`resetUserPolicyParameters(policyId, body)`	`useResetUserPolicyParameters`	Return to the defaults
`listUserPolicyParameterHistory(policyId, { beforeRevision })`	`useUserPolicyParameterHistory`	Earlier revisions

The two mutation hooks take { policyId, body }. A reset body has the same fields as a save, without values. How saved values behave:

Each save replaces the user’s values. A parameter you leave out of values falls back to the default, so send every value the user wants to keep. Unknown IDs are rejected.
Saving sets provenance to personal, and a reset sets it to default. Each save or reset adds a revision, except one that changes neither the values nor the provenance, such as saving the same values again. A stale expectedRevision returns 409 with user parameter revision changed; reload settings.
Consent covers the exact values. After a save or reset, the user consents again before the policy applies to them, for example through getPolicyConsentUrl({ walletId, policyId }).
When you publish a new version of the policy, the view returns status: "needs_confirmation" with the old values in previousValues. Until the user saves or resets for the new version, Para leaves the policy out for that user and fails closed.

Your backend can read limits but not change them. The REST SDK offers listUserAdjustablePolicies(userId), getUserPolicyParameters(userId, policyId) and listUserPolicyParameterHistory(userId, policyId).

Adjustable approval settings

Adjustable approval settings let your organization change parts of an approval requirement without publishing a new policy version. The policy declares which settings can change and within what limits. In policy JSON they are called safeKnobs.

Declare the settings

Add safeKnobs to the approvalRequirement. To let people other than your backend change them, add configurationManagerEligibility:

"approvalRequirement": {
  "id": "treasury-review",
  "amountFact": "request.value.baseUnits",
  "configurationManagerEligibility": [{ "kind": "role", "name": "treasury-admin" }],
  "stages": [
    { "id": "finance", "requiredApprovals": 2, "eligibility": [{ "kind": "role", "name": "finance" }] },
    { "id": "executive", "requiredApprovals": 1, "eligibility": [{ "kind": "role", "name": "cfo" }], "minimumAmount": "10000000000000000000" }
  ],
  "safeKnobs": [
    { "id": "finance-approvals", "kind": "required_approvals", "stageId": "finance", "min": 1, "max": 3 },
    {
      "id": "executive-threshold",
      "kind": "minimum_amount",
      "stageId": "executive",
      "min": "5000000000000000000",
      "max": "50000000000000000000"
    }
  ]
}

`kind`	Fields	Value you save
`required_approvals`	`stageId`, `min`, `max` (1 to 25)	An integer from `min` to `max`. The stage’s own `requiredApprovals` must be a number in that range.
`eligible_group`	`stageId`, `defaultOptionId`, `options` (each with `id` and `eligibility`)	The `id` of an option. The default option must match the stage’s own eligibility.
`minimum_amount`	`stageId`, and optionally `min` and `max` as amounts in base units	An amount in base units, as an integer string, from `min` to `max`. The stage must declare a `minimumAmount` inside that range, and the thresholds must stay positive and increasing from stage to stage.

A stage can have one participation setting (required_approvals or eligible_group) and one minimum_amount. Without max, a minimum_amount setting can only lower the stage’s threshold, because max defaults to the published minimumAmount. Set max to let people raise it, and min to stop them lowering it too far.

Read and update settings

Settings apply per authorization scope and per requirement in an active policy version. Every call identifies them with a reference:

const reference = {
  authorizationScopeId: "treasury",
  policyId: "treasury-guardrail",
  policyVersion: "3",
  requirementId: "treasury-review",
};

Your backend writes settings with the REST SDK and your secret API key. Configuration managers write them from a signed-in session with the same method names on the SDK client.

const { configuration } = await para.getEffectiveApprovalConfiguration(reference);

await para.updateApprovalConfiguration(reference, {
  expectedRevision: configuration?.revision ?? 0,
  values: { "finance-approvals": 3 },
});

getEffectiveApprovalConfiguration returns the saved configuration, or null before the first save, together with the effectiveRequirement that Para applies.

Method	Use
`listConfigurableApprovalRequirements(scopeId)`	Requirements in a scope that declare adjustable settings
`getEffectiveApprovalConfiguration(reference)`	Saved values and the requirement as Para applies it
`updateApprovalConfiguration(reference, body)`	Save values
`resetApprovalConfiguration(reference, { expectedRevision, force })`	Return to the published values. A revision number on its own also works.
`listApprovalConfigurationHistory(reference)`	Earlier revisions and who changed them
`getUserApprovalCapabilities(scopeId)`	SDK only: the requirements the signed-in user can manage

In React, useEffectiveApprovalConfiguration, useUpdateApprovalConfiguration (variables { reference, body }), useResetApprovalConfiguration (variables { reference, expectedRevision, force }), useApprovalConfigurationHistory and useUserApprovalCapabilities wrap the same calls. How saved settings behave:

A save replaces all values for the requirement in that scope. A setting you leave out returns to its published value.
An unknown ID fails with safe_knob_not_declared, and a value of the wrong type or out of range fails with safe_knob_value_invalid.
A stale expectedRevision returns 409. From the SDK this arrives as a plain request error, so read the configuration again after any failed write before you retry.
Saving or resetting invalidates open cases for the requirement in that scope, with terminalReason: "requirement_configuration_changed".
Settings belong to one policy version. After you publish a new version, its requirement starts from the published values, so save the settings again for the new version.

An approval case is open while it is pending, and after it completes until it is used to sign or expires. Para refuses a change that would invalidate open cases until you confirm it. A confirmed change ends those cases as invalidated, and their requests need a new attempt.Through the API, a refused change returns 409 with code APPROVAL_CASES_AFFECTED and the case IDs in affectedCaseIds, and nothing changes. To confirm it, send the same change again with force: true.The SDK throws PermissionsV2ApprovalCasesAffectedError, and the REST SDK throws a ParaRestError.

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Adjustable parameters

Personal limits

Declare a parameter

How users set their limits

Read and update limits from the SDK

Adjustable approval settings

Declare the settings

Read and update settings

​Personal limits

​Declare a parameter

​How users set their limits

​Read and update limits from the SDK

​Adjustable approval settings

​Declare the settings

​Read and update settings

Personal limits

Declare a parameter

How users set their limits

Read and update limits from the SDK

Adjustable approval settings

Declare the settings

Read and update settings