> For the complete documentation index, see [llms.txt](https://docs.paykun.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.paykun.com/technical-guide/web-integration/checkout-integration/web-integration-request.md). # Request Transaction can be initiated using form POST Request at following gateway URL : * For Live Transaction: * For Test Transaction: Form should contain three inputs to make this input as hidden to prevent exposure: * [merchant\_id](/technical-guide/api-encryption-key-guide.md) * [access\_token](/technical-guide/api-encryption-key-guide.md) * encrypted\_request Here, encrypted\_request is encrypted “||” separated data string, all parameters should first concat using “||” in the following format: param\_1: value\_1 || param\_2: value\_2 || param\_3: value\_3 || ... #### **Example :** ``` amount::20; billing_address::billing_address; billing_city::billing_city; billing_country::billing_country; billing_state::billing_state; billing_zip::billing_zip; customer_email::customer_email; customer_name::customer_name; customer_phone::customer_phone; failure_url::failure_url; order_no::order_no; product_name::product_name; shipping_address::shipping_address; shipping_city::shipping_city; shipping_country::shipping_country; shipping_state::shipping_state; shipping_zip::shipping_zip; success_url::success_url; udf_1::any_extra_param_you_want ``` And then it should be encrypted using the encryption algorithm shown in the following example of a form that can be used: **Example :** ```markup encrypt("amount::20;billing_address::billing_address;billing_city::billing_city;billing_country::billing_country;billing_state::billing_state;billing_zip::billing_zip;customer_email::customer_email;customer_name::customer_name;customer_phone::customer_phone;failure_url::failure_url;order_no::order_no;product_name::product_name;shipping_address::shipping_address;shipping_city::shipping_city;shipping_country::shipping_country;shipping_state::shipping_state;shipping_zip::shipping_zip;success_url::success_url;udf_1::any_extra_param_you_want", api_secret) ``` ```markup Processing Payment...
Processing your payment, please wait...
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