Improve gateway parameter handling to properly match the protocol description (SSP-2167) #307

Job	Run time
Quality control	41s
PHP-Linter (8.1) / linter	19s
PHP-Linter (8.2) / linter	15s
PHP-Linter (8.3) / linter	11s
PHP-Linter (8.4) / linter	12s
Linter / ecmascript-linter	20s
Linter / json-linter	28s
Linter / yaml-linter	4s
Linter / style-linter	0s
Unit tests, PHP 8.2, ubuntu-latest	25s
Unit tests, PHP 8.4, ubuntu-latest	30s
Unit tests, PHP 8.3, ubuntu-latest	24s
Unit tests, PHP 8.2, windows-latest	1m 8s
Unit tests, PHP 8.1, ubuntu-latest	30s
Unit tests, PHP 8.1, windows-latest	58s
Unit tests, PHP 8.4, windows-latest	1m 41s
Unit tests, PHP 8.3, windows-latest	1m 22s
Security checks	25s
Code coverage	11s
Cleanup artifacts	6s
	10m 10s

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