curl --request POST \
  --url https://us.api.flexprice.io/v1/checkout/sessions \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "customer_external_id": "<string>",
  "cancel_url": "<string>",
  "configuration": {
    "add_addon_params": {
      "addons": [
        {
          "addon_id": "<string>",
          "association_id": "<string>",
          "start_date": "2023-11-07T05:31:56Z"
        }
      ],
      "removes": [
        {
          "association_id": "<string>",
          "effective_date": "2023-11-07T05:31:56Z",
          "reason": "<string>"
        }
      ],
      "subscription_id": "<string>"
    },
    "create_subscription_params": {
      "currency": "<string>",
      "end_date": "2023-11-07T05:31:56Z",
      "lookup_key": "<string>",
      "metadata": {},
      "plan_id": "<string>",
      "start_date": "2023-11-07T05:31:56Z",
      "subscription_id": "<string>"
    },
    "modify_subscription_params": {
      "line_item_modifications": [
        {
          "effective_date": "2023-11-07T05:31:56Z",
          "line_item_id": "<string>",
          "quantity": "<string>"
        }
      ],
      "subscription_id": "<string>"
    }
  },
  "entity_creation_options": {
    "entity_creation_conflict_policies": {}
  },
  "failure_url": "<string>",
  "idempotency_key": "<string>",
  "metadata": {},
  "payment_provider_config": {
    "customer_not_present": true,
    "max_mandate_limit": "<string>"
  },
  "success_url": "<string>"
}
'

import requests

url = "https://us.api.flexprice.io/v1/checkout/sessions"

payload = {
    "customer_external_id": "<string>",
    "cancel_url": "<string>",
    "configuration": {
        "add_addon_params": {
            "addons": [
                {
                    "addon_id": "<string>",
                    "association_id": "<string>",
                    "start_date": "2023-11-07T05:31:56Z"
                }
            ],
            "removes": [
                {
                    "association_id": "<string>",
                    "effective_date": "2023-11-07T05:31:56Z",
                    "reason": "<string>"
                }
            ],
            "subscription_id": "<string>"
        },
        "create_subscription_params": {
            "currency": "<string>",
            "end_date": "2023-11-07T05:31:56Z",
            "lookup_key": "<string>",
            "metadata": {},
            "plan_id": "<string>",
            "start_date": "2023-11-07T05:31:56Z",
            "subscription_id": "<string>"
        },
        "modify_subscription_params": {
            "line_item_modifications": [
                {
                    "effective_date": "2023-11-07T05:31:56Z",
                    "line_item_id": "<string>",
                    "quantity": "<string>"
                }
            ],
            "subscription_id": "<string>"
        }
    },
    "entity_creation_options": { "entity_creation_conflict_policies": {} },
    "failure_url": "<string>",
    "idempotency_key": "<string>",
    "metadata": {},
    "payment_provider_config": {
        "customer_not_present": True,
        "max_mandate_limit": "<string>"
    },
    "success_url": "<string>"
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    customer_external_id: '<string>',
    cancel_url: '<string>',
    configuration: {
      add_addon_params: {
        addons: [
          {
            addon_id: '<string>',
            association_id: '<string>',
            start_date: '2023-11-07T05:31:56Z'
          }
        ],
        removes: [
          {
            association_id: '<string>',
            effective_date: '2023-11-07T05:31:56Z',
            reason: '<string>'
          }
        ],
        subscription_id: '<string>'
      },
      create_subscription_params: {
        currency: '<string>',
        end_date: '2023-11-07T05:31:56Z',
        lookup_key: '<string>',
        metadata: {},
        plan_id: '<string>',
        start_date: '2023-11-07T05:31:56Z',
        subscription_id: '<string>'
      },
      modify_subscription_params: {
        line_item_modifications: [
          {
            effective_date: '2023-11-07T05:31:56Z',
            line_item_id: '<string>',
            quantity: '<string>'
          }
        ],
        subscription_id: '<string>'
      }
    },
    entity_creation_options: {entity_creation_conflict_policies: {}},
    failure_url: '<string>',
    idempotency_key: '<string>',
    metadata: {},
    payment_provider_config: {customer_not_present: true, max_mandate_limit: '<string>'},
    success_url: '<string>'
  })
};

fetch('https://us.api.flexprice.io/v1/checkout/sessions', 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://us.api.flexprice.io/v1/checkout/sessions",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'customer_external_id' => '<string>',
    'cancel_url' => '<string>',
    'configuration' => [
        'add_addon_params' => [
                'addons' => [
                                [
                                                                'addon_id' => '<string>',
                                                                'association_id' => '<string>',
                                                                'start_date' => '2023-11-07T05:31:56Z'
                                ]
                ],
                'removes' => [
                                [
                                                                'association_id' => '<string>',
                                                                'effective_date' => '2023-11-07T05:31:56Z',
                                                                'reason' => '<string>'
                                ]
                ],
                'subscription_id' => '<string>'
        ],
        'create_subscription_params' => [
                'currency' => '<string>',
                'end_date' => '2023-11-07T05:31:56Z',
                'lookup_key' => '<string>',
                'metadata' => [
                                
                ],
                'plan_id' => '<string>',
                'start_date' => '2023-11-07T05:31:56Z',
                'subscription_id' => '<string>'
        ],
        'modify_subscription_params' => [
                'line_item_modifications' => [
                                [
                                                                'effective_date' => '2023-11-07T05:31:56Z',
                                                                'line_item_id' => '<string>',
                                                                'quantity' => '<string>'
                                ]
                ],
                'subscription_id' => '<string>'
        ]
    ],
    'entity_creation_options' => [
        'entity_creation_conflict_policies' => [
                
        ]
    ],
    'failure_url' => '<string>',
    'idempotency_key' => '<string>',
    'metadata' => [
        
    ],
    'payment_provider_config' => [
        'customer_not_present' => true,
        'max_mandate_limit' => '<string>'
    ],
    'success_url' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>"
  ],
]);

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

curl_close($curl);

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

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://us.api.flexprice.io/v1/checkout/sessions"

	payload := strings.NewReader("{\n  \"customer_external_id\": \"<string>\",\n  \"cancel_url\": \"<string>\",\n  \"configuration\": {\n    \"add_addon_params\": {\n      \"addons\": [\n        {\n          \"addon_id\": \"<string>\",\n          \"association_id\": \"<string>\",\n          \"start_date\": \"2023-11-07T05:31:56Z\"\n        }\n      ],\n      \"removes\": [\n        {\n          \"association_id\": \"<string>\",\n          \"effective_date\": \"2023-11-07T05:31:56Z\",\n          \"reason\": \"<string>\"\n        }\n      ],\n      \"subscription_id\": \"<string>\"\n    },\n    \"create_subscription_params\": {\n      \"currency\": \"<string>\",\n      \"end_date\": \"2023-11-07T05:31:56Z\",\n      \"lookup_key\": \"<string>\",\n      \"metadata\": {},\n      \"plan_id\": \"<string>\",\n      \"start_date\": \"2023-11-07T05:31:56Z\",\n      \"subscription_id\": \"<string>\"\n    },\n    \"modify_subscription_params\": {\n      \"line_item_modifications\": [\n        {\n          \"effective_date\": \"2023-11-07T05:31:56Z\",\n          \"line_item_id\": \"<string>\",\n          \"quantity\": \"<string>\"\n        }\n      ],\n      \"subscription_id\": \"<string>\"\n    }\n  },\n  \"entity_creation_options\": {\n    \"entity_creation_conflict_policies\": {}\n  },\n  \"failure_url\": \"<string>\",\n  \"idempotency_key\": \"<string>\",\n  \"metadata\": {},\n  \"payment_provider_config\": {\n    \"customer_not_present\": true,\n    \"max_mandate_limit\": \"<string>\"\n  },\n  \"success_url\": \"<string>\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://us.api.flexprice.io/v1/checkout/sessions")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customer_external_id\": \"<string>\",\n  \"cancel_url\": \"<string>\",\n  \"configuration\": {\n    \"add_addon_params\": {\n      \"addons\": [\n        {\n          \"addon_id\": \"<string>\",\n          \"association_id\": \"<string>\",\n          \"start_date\": \"2023-11-07T05:31:56Z\"\n        }\n      ],\n      \"removes\": [\n        {\n          \"association_id\": \"<string>\",\n          \"effective_date\": \"2023-11-07T05:31:56Z\",\n          \"reason\": \"<string>\"\n        }\n      ],\n      \"subscription_id\": \"<string>\"\n    },\n    \"create_subscription_params\": {\n      \"currency\": \"<string>\",\n      \"end_date\": \"2023-11-07T05:31:56Z\",\n      \"lookup_key\": \"<string>\",\n      \"metadata\": {},\n      \"plan_id\": \"<string>\",\n      \"start_date\": \"2023-11-07T05:31:56Z\",\n      \"subscription_id\": \"<string>\"\n    },\n    \"modify_subscription_params\": {\n      \"line_item_modifications\": [\n        {\n          \"effective_date\": \"2023-11-07T05:31:56Z\",\n          \"line_item_id\": \"<string>\",\n          \"quantity\": \"<string>\"\n        }\n      ],\n      \"subscription_id\": \"<string>\"\n    }\n  },\n  \"entity_creation_options\": {\n    \"entity_creation_conflict_policies\": {}\n  },\n  \"failure_url\": \"<string>\",\n  \"idempotency_key\": \"<string>\",\n  \"metadata\": {},\n  \"payment_provider_config\": {\n    \"customer_not_present\": true,\n    \"max_mandate_limit\": \"<string>\"\n  },\n  \"success_url\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://us.api.flexprice.io/v1/checkout/sessions")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"customer_external_id\": \"<string>\",\n  \"cancel_url\": \"<string>\",\n  \"configuration\": {\n    \"add_addon_params\": {\n      \"addons\": [\n        {\n          \"addon_id\": \"<string>\",\n          \"association_id\": \"<string>\",\n          \"start_date\": \"2023-11-07T05:31:56Z\"\n        }\n      ],\n      \"removes\": [\n        {\n          \"association_id\": \"<string>\",\n          \"effective_date\": \"2023-11-07T05:31:56Z\",\n          \"reason\": \"<string>\"\n        }\n      ],\n      \"subscription_id\": \"<string>\"\n    },\n    \"create_subscription_params\": {\n      \"currency\": \"<string>\",\n      \"end_date\": \"2023-11-07T05:31:56Z\",\n      \"lookup_key\": \"<string>\",\n      \"metadata\": {},\n      \"plan_id\": \"<string>\",\n      \"start_date\": \"2023-11-07T05:31:56Z\",\n      \"subscription_id\": \"<string>\"\n    },\n    \"modify_subscription_params\": {\n      \"line_item_modifications\": [\n        {\n          \"effective_date\": \"2023-11-07T05:31:56Z\",\n          \"line_item_id\": \"<string>\",\n          \"quantity\": \"<string>\"\n        }\n      ],\n      \"subscription_id\": \"<string>\"\n    }\n  },\n  \"entity_creation_options\": {\n    \"entity_creation_conflict_policies\": {}\n  },\n  \"failure_url\": \"<string>\",\n  \"idempotency_key\": \"<string>\",\n  \"metadata\": {},\n  \"payment_provider_config\": {\n    \"customer_not_present\": true,\n    \"max_mandate_limit\": \"<string>\"\n  },\n  \"success_url\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body

{
  "action": "create_subscription",
  "cancel_url": "<string>",
  "cancelled_at": "2023-11-07T05:31:56Z",
  "checkout_invoice_id": "<string>",
  "checkout_payment_id": "<string>",
  "checkout_status": "initiated",
  "completed_at": "2023-11-07T05:31:56Z",
  "created_at": "2023-11-07T05:31:56Z",
  "customer_id": "<string>",
  "entity_creation_result": {
    "entity_id": "<string>",
    "status": "created"
  },
  "expires_at": "2023-11-07T05:31:56Z",
  "failure_reason": "<string>",
  "failure_url": "<string>",
  "id": "<string>",
  "idempotency_key": "<string>",
  "metadata": {},
  "next_poll_after_ms": 123,
  "payment": {
    "gateway": "<string>",
    "id": "<string>",
    "status": "INITIATED"
  },
  "payment_action": {
    "type": "checkout_url",
    "url": "<string>"
  },
  "payment_provider": "razorpay",
  "stale": true,
  "success_url": "<string>",
  "terminal": true,
  "updated_at": "2023-11-07T05:31:56Z"
}

{
  "code": "http_client_error",
  "http_status_code": 123,
  "message": "<string>"
}

{
  "code": "http_client_error",
  "http_status_code": 123,
  "message": "<string>"
}

{
  "code": "http_client_error",
  "http_status_code": 123,
  "message": "<string>"
}