docs: add FederationService docs

docs/.vitepress/sidebar.ts

@@ -103,7 +103,11 @@ const FedimintWalletSidebar = [
       {
         text: 'FederationService',
         base: '/core/FedimintWallet/FederationService/',
-        items: [{ text: 'Docs TODO' }],
+        items: [
+          { text: 'getConfig()', link: 'getConfig' },
+          { text: 'getFederationId()', link: 'getFederationId' },
+          { text: 'getInviteCode()', link: 'getInviteCode' },
+        ],
       },
       {
         text: 'RecoveryService',

docs/core/FedimintWallet/FederationService/getConfig.md

@@ -0,0 +1,15 @@
+# Redeem Ecash
+
+### `federation.getConfig()`
+
+Access configuration details about a connected federation.
+
+```ts twoslash
+// @esModuleInterop
+import { FedimintWallet } from '@fedimint/core-web'
+
+const wallet = new FedimintWallet()
+wallet.open()
+
+const config = await wallet.federation.getConfig() // [!code focus]
+```

docs/core/FedimintWallet/FederationService/getFederationId.md

@@ -0,0 +1,15 @@
+# Redeem Ecash
+
+### `federation.getFederationId()`
+
+Access the `federationId` of the connected Federation.
+
+```ts twoslash
+// @esModuleInterop
+import { FedimintWallet } from '@fedimint/core-web'
+
+const wallet = new FedimintWallet()
+wallet.open()
+
+const config = await wallet.federation.getFederationId() // [!code focus]
+```

docs/core/FedimintWallet/FederationService/getInviteCode.md

@@ -0,0 +1,17 @@
+# Redeem Ecash
+
+### `federation.getInviteCode()`
+
+Access the invite code for the connected federation.
+
+```ts twoslash
+// @esModuleInterop
+import { FedimintWallet } from '@fedimint/core-web'
+
+const wallet = new FedimintWallet()
+wallet.open()
+
+const peerId = 0 // Index of the guardian to ask for the invite code // [!code focus]
+
+const inviteCode = await wallet.federation.getInviteCode(peerId) // [!code focus]
+```

packages/core-web/src/services/FederationService.ts

@@ -12,7 +12,7 @@ export class FederationService {
     return await this.client.rpcSingle<string>('', 'get_federation_id', {})
   }
 
-  async getInviteCode(peer: number) {
+  async getInviteCode(peer: number = 0) {
     return await this.client.rpcSingle<string | null>('', 'get_invite_code', {
       peer,
     })