Merge fork changes through 2023

[systemallica]

Context

This PR is the first step toward reuniting systemallica/python-redsys with the original ddiazpinto/python-redsys repository.

It contains only the changes that had accumulated in the fork up to October 2023. The more recent updates made in 2026 are intentionally excluded so this historical set can be reviewed and merged independently. Once this PR is merged, we can evaluate how to bring selected configuration changes forward and integrate the newer work in a separate follow-up PR.

Included changes

• Replaces the abandoned pycrypto package with pycryptodome.
• Migrates the project to Poetry and adds development tooling such as pre-commit, Black, isort, and pyupgrade.
• Refactors and adds tests for request and response handling.
• Exposes additional response parameters, including Ds_Amount_Euro and unlisted merchant parameters.
• Adds support for BIZUM payments.
• Allows order IDs with up to 12 characters.
• Updates CI, release configuration, dependencies, documentation, changelog, and package metadata through version 1.2.0.

Scope

The branch is based on the current ddiazpinto/python-redsys master branch and ends at the last fork commit from October 2023. It deliberately excludes the 2026 migration to uv, newer dependency and pre-commit updates, the manual release workflow, and the Makefile removal.

Validation

• uv run pytest
• 13 tests passed.