Строка, которая генерируется в браузере - https://secure.openbank.ru/openapi/deploy/3.6/open_site/payment.do?cvc=123&backUrl=https%3A%2F%2Fsecure.openbank.ru%2Fopenapi%2Fdeploy%2Fopen_site%2Findex.html%3FpartnerId%3Dopen_site%26sessionId%3D&serviceId=1182&language=ru&currency=643&email=speakeazy.yt%40yandex.ru&isMobile=false&serviceParams=%7B%22fio%22%3A%22%D0%91%D0%B0%D0%BD%D0%BA+%D0%9E%D1%82%D0%BA%D1%80%D1%8B%D1%82%D0%B8%D0%B5%22%2C%22account%22%3A%22410013776434355%22%2C%22address%22%3A%22115114%2C+%D0%B3.+%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0%2C+%D1%83%D0%BB.+%D0%9B%D0%B5%D1%82%D0%BD%D0%B8%D0%BA%D0%BE%D0%B2%D1%81%D0%BA%D0%B0%D1%8F%2C+%D0%B4.+2%2C+%D1%81%D1%82%D1%80.+4%22%2C%22description%22%3A%22%22%2C%22receipt%22%3A%22%22%2C%22regionName%22%3A%22%D0%A1%D0%B0%D1%80%D0%B0%D1%82%D0%BE%D0%B2%D1%81%D0%BA%D0%B0%D1%8F+%D0%BE%D0%B1%D0%BB.%22%2C%22rbs_partnerId%22%3A%22open_site%22%7D&pan=5391750000202925&expiry=123456&amount=10.00

Строка, которая генерируется моим PHP скриптом - https://secure.openbank.ru/openapi/deploy/3.6/open_site/payment.do?cvc=123&backUrl=https%3A%2F%2Fsecure.openbank.ru%2Fopenapi%2Fdeploy%2Fopen_site%2Findex.html%3FpartnerId%3Dopen_site%26sessionId%3D&serviceId=1182&language=ru&currency=643&email=speakeazy.yt%40yandex.ru&isMobile=false&serviceParams%5Bfio%5D=%D0%91%D0%B0%D0%BD%D0%BA+%D0%9E%D1%82%D0%BA%D1%80%D1%8B%D1%82%D0%B8%D0%B5&serviceParams%5Baccount%5D=410013776434355&serviceParams%5Baddress%5D=115114%2C+%D0%B3.+%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0%2C+%D1%83%D0%BB.+%D0%9B%D0%B5%D1%82%D0%BD%D0%B8%D0%BA%D0%BE%D0%B2%D1%81%D0%BA%D0%B0%D1%8F%2C+%D0%B4.+2%2C+%D1%81%D1%82%D1%80.+4&serviceParams%5Bdescription%5D=&serviceParams%5Breceipt%5D=&serviceParams%5BregionName%5D=%D0%A1%D0%B0%D1%80%D0%B0%D1%82%D0%BE%D0%B2%D1%81%D0%BA%D0%B0%D1%8F+%D0%BE%D0%B1%D0%BB.&serviceParams%5Brbs_partnerId%5D=open_site&pan=5391750000202925&expiry=123456&amount=10.00