Update readme

README.md

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 # Dummy Payment Server
 
-Made for testing Saleor's [Transaction API](https://github.com/saleor/saleor/pull/10350) (`transactionEventReport` mutation)
+Made for testing Saleor's Transaction API
+
+## Installation
+
+### Deno
+
+This project requires deno to be installed. [Follow official installation instructions](https://deno.land/manual@v1.36.0/getting_started/installation) if deno is not installed on your system
+
+### Running app
+
+Start app:
+
+```
+deno task start
+```
+
+### Tunnel
+
+Create a tunnel, to make your app accessible from Internet. You can use [Cloudflare Tunnel](https://developers.cloudflare.com/cloudflare-one/connections/connect-networks/install-and-setup/tunnel-guide/local/):
+
+```
+cloudflared tunnel --url localhost:5544
+```
+
+or by using ngrook:
+
+```
+ngrok http 5544
+```
+
+> _Note_
+> Saleor CLI's tunnel doesn't work with Deno
+
+### Install app
+
+After running a tunnel install the app in Saleor.
+
+- In Dashboard: go to Apps > Install external app
+- In CLI: `saleor app install`
+
+** The manifest URL is: your tunnel URL + `/manifest`**.
+
+For example, if your tunnel URL is `https://happy-tunnel.com` then the manifest URL will be `https://happy-tunnel.com/manifest`
+
+After installation `auth_token` will be visible in the console. It is also stored inside `.token` file.
+
+## Example usage
+
+The app id is `witoszekdev.dummy-payment-app`.
+
+The app has excessive permissions for debug purposes. They can be modified inside `main.ts` file
+
+### `paymentGatewayInitialize`
+
+```graphql
+mutation GatewayInitialize($id: ID!) {
+  paymentGatewayInitialize(
+    id: $id
+    paymentGateways: [{ id: "witoszekdev.dummy-payment-app" }]
+  ) {
+    gatewayConfigs {
+      id
+      data
+      errors {
+        field
+        message
+        code
+      }
+    }
+    errors {
+      field
+      message
+      code
+    }
+  }
+}
+```
+
+Variables:
+
+```json
+{
+  "id": "<checkout_id>"
+}
+```
+
+### `transactionInitialize`
+
+```graphql
+mutation TransactionInitalize(
+  $amount: PositiveDecimal
+  $checkoutId: ID!
+  $data: JSON
+) {
+  transactionInitialize(
+    amount: $amount
+    id: $checkoutId
+    paymentGateway: { id: "witoszekdev.dummy-payment-app", data: $data }
+  ) {
+    transaction {
+      id
+      actions
+      message
+      pspReference
+    }
+    data
+    errors {
+      field
+      message
+      code
+    }
+  }
+}
+```
+
+Variables:
+
+```json
+{
+  "checkoutId": "<checkout_id>",
+  "amount": 100 // your checkout amount
+  "data": {
+    "final": true
+  }
+}
+```
+
+When you provide `data.final = true`, then the app will return `CHARGE_SUCCESS` response, otherwise it will return `CHARGE_REQUESTED`.
+
+### `transactionProcess`
+
+```graphql
+mutation TransactionProcess($transactionId: ID!) {
+  transactionProcess(data: {}, id: $transactionId) {
+    transaction {
+      id
+    }
+    transactionEvent {
+      id
+      createdAt
+      pspReference
+      message
+      externalUrl
+      amount {
+        currency
+        amount
+      }
+      type
+    }
+    data
+    errors {
+      field
+      message
+      code
+    }
+  }
+}
+```
+
+Variables:
+
+```json
+{
+  "transactionId": "<transaction id from transactionInitialzie>"
+}
+```