Developer Docs

Build With Payyd SDKs

This documentation covers the Payyd SDK contract shared by .NET, PHP, Python, JS, and Go: authentication, Hosted Payin, S2S Payin, Payouts, and download/distribution instructions.

What You Get

Single reference for all transaction flows and method names.
Credential model: public/secret key signing plus username/password token auth.
Direct SDK download links with integrity checksums.
Method-level guidance for Hosted, S2S, and Payout integrations.

SDK Languages

18+

Enterprise Client Methods

Core API Areas

Start Here

Install the SDK package for your language and confirm checksums.

Go to SDK Downloads

Auth Model

Understand request signing vs bearer token responsibilities.

Read Authentication Guide

Method Coverage

Review all Hosted, S2S, and Payout method signatures.

Open Method Reference

Flow Differences

Understand when to use Hosted, S2S, or Payout.

Open Differences & Notes

Callback Webhooks

See the callback payload, signing headers, and receiver-side verification guidance.

Open Callback Guide

API Domains

Domain	Typical Flow	Main Methods
Payin Hosted	Create transaction and redirect customer to hosted URL.	payin_hosted_create_transaction, payin_hosted_get_transaction_by_reference
Payin S2S	Create, collect sender details in your backend, and submit pay transaction.	payin_s2s_create_transaction, payin_s2s_pay_transaction
Payout	Send funds to a receiver bank account.	payout_create_transaction, payout_get_transaction

Note: Method names stay consistent across SDKs where possible. The PHP SDK shown here enforces request signing in PayydEnterpriseClient and supports country rule validation for S2S pay requests.