curl -X PUT \
 /checkout-links/{id} \
 --header "Content-Type: application/json" \
 --header "Authorization: Bearer <token>" \
 --data '{
    "afterCheckout": {
        "url": "https:\/\/example.com\/checkout\/confirmation",
        "confirmationMessage": "Thank you for your order!",
        "action": "redirect",
        "backToProviderUrl": "https:\/\/example.com\/checkout\/confirmation"
    },
    "options": {
        "trialDays": "14",
        "allowCoupons": "",
        "quantityEditable": "",
        "forceCompany": ""
    },
    "isEnabled": "1",
    "items": [
        []
    ]
}'

import requests

url = "https://coreapi.io/checkout-links/{id}"

payload = {
    "afterCheckout": {
        "url": "https://example.com/checkout/confirmation",
        "confirmationMessage": "Thank you for your order!",
        "action": "redirect",
        "backToProviderUrl": "https://example.com/checkout/confirmation"
    },
    "options": { "trialDays": 14 },
    "isEnabled": True,
    "items": [
        {
            "type": "product",
            "product": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
            "quantity": 1,
            "plan": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
            "price": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
            "periods": [
                {
                    "contractPeriod": "1M",
                    "cancellationPeriod": "1M"
                }
            ]
        }
    ]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    afterCheckout: {
      url: 'https://example.com/checkout/confirmation',
      confirmationMessage: 'Thank you for your order!',
      action: 'redirect',
      backToProviderUrl: 'https://example.com/checkout/confirmation'
    },
    options: {trialDays: 14},
    isEnabled: true,
    items: [
      {
        type: 'product',
        product: 'ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b',
        quantity: 1,
        plan: 'ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b',
        price: 'ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b',
        periods: [{contractPeriod: '1M', cancellationPeriod: '1M'}]
      }
    ]
  })
};

fetch('https://coreapi.io/checkout-links/{id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://coreapi.io/checkout-links/{id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'afterCheckout' => [
        'url' => 'https://example.com/checkout/confirmation',
        'confirmationMessage' => 'Thank you for your order!',
        'action' => 'redirect',
        'backToProviderUrl' => 'https://example.com/checkout/confirmation'
    ],
    'options' => [
        'trialDays' => 14
    ],
    'isEnabled' => true,
    'items' => [
        [
                'type' => 'product',
                'product' => 'ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b',
                'quantity' => 1,
                'plan' => 'ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b',
                'price' => 'ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b',
                'periods' => [
                                [
                                                                'contractPeriod' => '1M',
                                                                'cancellationPeriod' => '1M'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

{
  "id": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
  "afterCheckout": {
    "url": "https://example.com/checkout/confirmation",
    "confirmationMessage": "Thank you for your order!",
    "action": "redirect",
    "backToProviderUrl": "https://example.com/checkout/confirmation"
  },
  "options": {
    "trialDays": 14,
    "allowCoupons": true,
    "quantityEditable": true,
    "forceCompany": true
  },
  "slug": "my-checkout-slug",
  "isEnabled": true,
  "items": [
    {
      "type": "product",
      "product": {
        "id": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
        "name": "Basic",
        "description": "For small teams.",
        "customFields": {
          "field1": "value1",
          "field2": "value2"
        }
      },
      "quantity": 1,
      "plan": {
        "id": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
        "family": {
          "id": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b"
        },
        "code": "basic-m2023",
        "originProduct": {
          "id": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
          "name": "Basic",
          "description": "For small teams.",
          "customFields": {
            "field1": "value1",
            "field2": "value2"
          }
        },
        "allowCheckout": true,
        "status": "draft",
        "createdAt": "2023-11-07T05:31:56Z",
        "name": "<string>",
        "description": "<string>"
      },
      "price": {
        "type": "flat_fee",
        "currencyCode": "EUR",
        "price": {
          "amount": 123,
          "createdAt": "2021-01-01T00:00:00+00:00",
          "updatedAt": "2021-01-01T00:00:00+00:00",
          "tenantId": "<string>"
        },
        "id": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
        "internalName": "Exclusive pricing for partners.",
        "status": "active",
        "salesChannel": {
          "id": "<string>",
          "name": "<string>",
          "brandName": "<string>"
        },
        "applyTrial": true,
        "payInAdvance": true,
        "proRata": true,
        "freeUnits": 1,
        "billingInterval": "1M",
        "showPricePerInterval": "1M",
        "custom": true,
        "charge": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
        "productSetOption": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
        "product": "<unknown>",
        "customer": "<unknown>",
        "inUse": true,
        "checkoutLinkIds": [
          "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b"
        ]
      },
      "periods": [
        {
          "contractPeriod": {},
          "cancellationPeriod": {}
        }
      ]
    }
  ],
  "url": "https://example.com/checkout/my-checkout-slug"
}