diff --git a/src/FiatAssetAdapter.ts b/src/FiatAssetAdapter.ts
index 1166443..8eba646 100644
--- a/src/FiatAssetAdapter.ts
+++ b/src/FiatAssetAdapter.ts
@@ -3,9 +3,11 @@ import { AssetAdapter, FiatSwapAsset, SwapAsset, Transaction } from './IAssetAda
 
 export type HtlcDetails = OasisHtlc;
 
+type SettleHtlcTokens = { authorization: string, smsApi: string };
+
 export interface OasisClient {
     getHtlc(id: string): Promise<HtlcDetails>;
-    settleHtlc(id: string, secret: string, settlementJWS: string, authorizationToken?: string): Promise<HtlcDetails>;
+    settleHtlc(id: string, secret: string, settlementJWS: string, tokens?: SettleHtlcTokens): Promise<HtlcDetails>;
 }
 
 export class FiatAssetAdapter implements AssetAdapter<FiatSwapAsset> {
@@ -101,7 +103,7 @@ export class FiatAssetAdapter implements AssetAdapter<FiatSwapAsset> {
         settlementJWS: string,
         secret: string,
         hash: string,
-        authorizationToken?: string,
+        tokens?: SettleHtlcTokens,
     ): Promise<HtlcDetails> {
         if (this.stopped) throw new Error('FiatAssetAdapter called while stopped');
 
@@ -112,7 +114,7 @@ export class FiatAssetAdapter implements AssetAdapter<FiatSwapAsset> {
 
         let htlc: HtlcDetails;
         try {
-            htlc = await this.client.settleHtlc(payload.contractId, secret, settlementJWS, { authorization: authorizationToken });
+            htlc = await this.client.settleHtlc(payload.contractId, secret, settlementJWS, tokens);
         } catch (error) {
             console.error(error); // eslint-disable-line no-console
             htlc = await this.client.getHtlc(payload.contractId);
diff --git a/src/IAssetAdapter.ts b/src/IAssetAdapter.ts
index 868a9d5..0d77934 100644
--- a/src/IAssetAdapter.ts
+++ b/src/IAssetAdapter.ts
@@ -65,7 +65,10 @@ export interface AssetAdapter<TAsset extends SwapAsset> {
         serializedTx: string,
         secret: string,
         hash: string,
-        authorizationToken?: string,
+        tokens?: {
+            authorization: string,
+            smsApi: string
+        }
     ): Promise<Transaction<TAsset>>;
 
     awaitSettlementConfirmation(