add pesalink code snippets

Author: Andrew-Paystack

src/doc/payments/payment-methods/pesalink/config.yml

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+languages:   
+  - sh
+  - js
+  - php
+  - json

src/doc/payments/payment-methods/pesalink/index.js

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+const https = require('https')
+
+const params = JSON.stringify({ 
+  "email": "[email protected]", 
+  "amount": "10000",
+  "bank_transfer": {
+    "account_expires_at": "2025-04-24T16:40:57.954Z"
+  }
+})
+
+const options = {
+  hostname: 'api.paystack.co',
+  port: 443,
+  path: '/charge',
+  method: 'POST',
+  headers: {
+    Authorization: 'Bearer SECRET_KEY',
+    'Content-Type': 'application/json'
+  }
+}
+
+const req = https.request(options, res => {
+  let data = ''
+
+  res.on('data', (chunk) => {
+    data += chunk
+  });
+
+  res.on('end', () => {
+    console.log(JSON.parse(data))
+  })
+}).on('error', error => {
+  console.error(error)
+})
+
+req.write(params)
+req.end()

src/doc/payments/payment-methods/pesalink/index.json

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+{
+  "status": true,
+  "message": "Charge attempted",
+  "data": {
+    "reference": "kcvu0t3kzs",
+    "status": "pending_bank_transfer",
+    "display_text": "Please make a transfer to the account specified",
+    "account_name": "Paystack Payments Kenya Limited",
+    "account_number": "1260257501",
+    "bank": {
+      "slug": "diamond-trust-bank-ltd-ke",
+      "name": "Diamond Trust Bank Kenya Ltd",
+      "id": 225
+    },
+    "account_expires_at": "2025-04-24T16:55:57.954Z"
+  }
+}

src/doc/payments/payment-methods/pesalink/index.php

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+<?php
+  $curl = curl_init();
+
+  curl_setopt_array($curl, array(
+    CURLOPT_URL => "https://api.paystack.co/charge",
+    CURLOPT_RETURNTRANSFER => true,
+    CURLOPT_ENCODING => "",
+    CURLOPT_MAXREDIRS => 10,
+    CURLOPT_TIMEOUT => 30,
+    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
+    CURLOPT_CUSTOMREQUEST => "POST",
+    CURLOPT_POSTFIELDS => [
+      "email" => "[email protected]", 
+      "amount" => "10000",
+      "bank_transfer" => [
+        "account_expires_at" => "2025-04-24T16:40:57.954Z"
+      ]
+    ],
+    CURLOPT_HTTPHEADER => array(
+      "Authorization: Bearer SECRET_KEY",
+      "Cache-Control: no-cache"
+    ),
+  ));
+
+  $response = curl_exec($curl);
+  $err = curl_error($curl);
+
+  curl_close($curl);
+
+  if ($err) {
+    echo "cURL Error #:" . $err;
+  } else {
+    echo $response;
+  }
+?>

src/doc/payments/payment-methods/pesalink/index.sh

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+#!/bin/sh
+
+url="https://api.paystack.co/charge"
+authorization="Authorization: Bearer YOUR_SECRET_KEY"
+content_type="Content-Type: application/json"
+data='{ 
+  "email": "[email protected]", 
+  "amount": "10000", 
+  "bank_transfer": {
+    "account_expires_at": "2025-04-24T16:40:57.954Z"
+  } 
+}'
+
+curl "$url" -H "$authorization" -H "$content_type" -d "$data" -X POST