internal/

Package cryptox holds the cryptographic primitives the Iranian PSPs ask for: 3DES-ECB signatures (Sadad), AES-CBC plus RSA envelopes (IranKish) and RSA signatures over the request body (Pasargad).

Package gwopt carries the gateway specific option state that lives inside core.Options, so every gateway package expresses its own options with the shared core.Option type instead of inventing a parallel one.

Package soap is the minimal SOAP 1.1 client used by the bank gateways that still expose a webservice (Parsian, Mellat).

Package testutil holds the fake gateway server the package's own tests are written against.

Package tokenauth caches the short lived bearer tokens the OAuth style gateways hand out, so a gateway value can be built once at start-up and then shared by every request without re-authenticating on each call.

Package transport is the HTTP plumbing shared by every gateway: JSON, form and raw calls with timeout, retry, logging and header handling.