(Reuters) - Shares in Worldline tumbled to an all-time low on Thursday after the French payment technology group cut its 2024 outlook, citing a sharp decline in domestic consumption trends across Europe and uncertainty about a potential recovery.

The payments industry is under pressure as the post-pandemic boom wanes and competition intensifies.

Worldline shares dropped 15.5% to 8.87 euros by 0913 GMT, their lowest price ever, in what was the biggest daily decline among the members of the European benchmark STOXX 600 index.

"The Group has observed a softer macroeconomic and consumption environment in the second quarter with a progressive slowdown of the merchant services volumes growth across all the geographies in Europe," the company said in the earnings statement.

Reuters reported in January that Worldline has enlisted bankers to develop a defence strategy to reassure shareholders and prevent a hostile takeover following a sharp decline in its share price.

The company, which processes digital transactions for clients ranging from merchants to government agencies, forecast full-year organic revenue growth of around 2% to 3% and adjusted earnings before interest, tax, depreciation and amortisation (EBITDA) of 1.13 billion to 1.17 billion euros ($1.22 billion to $1.26 billion).

It had previously expected revenue growth at minimum of 3% and an adjusted EBITDA of "at least" 1.17 billion euros.

Worldline said it had taken extra measures to protect its annual cash flow target of 230 million euros.

"We have seen an improvement in volumes since the start of the month compared with the low point in June, which is rather encouraging," CEO Gilles Grapinet told journalists.

The group said its partnerships and restructuring programme, known as Power24, was progressing well, and raised by 10% its cost savings target for 2025 to around 220 million euros.

But the implementation of the first big-scale restructuring programme since its listing in Paris 10 years ago cost Worldline 174 million euros in non-cash provision in the first half of 2024, resulting in a net loss of 29 million euros over the period.

($1 = 0.9252 euros)

(Reporting by Dagmarah Mackos in Gdansk; Editing by Chizu Nomiyama and Milla Nissi)