Prince of Wales congratulates 90-year-old raising money by climbing staircase
Mrs Payne has raised over £390,000 in the last two months.
With just 30 flights to go before she completes her goal, Charles - known in Scotland as the Duke of Rothesay - has sent a letter of support congratulating Mrs Payne.
In the letter, Prince Charles wrote: "My wife and I just wanted to add to what I suspect is a very large number of messages of support by saying how inspiring it has been to witness the huge success of your fundraising efforts.
"These past few months have seen our country face immense challenges. Many people are grieving the tragic loss of their loved ones.
"The marvellous community spirit, for which Scotland is so renowned, has never been so much in evidence as people across our society have gone the extra mile, have put others first and have sacrificed their own comfort for the common good.
"There could hardly be a better example of this indomitable spirit than your own magnificent efforts in raising money for vital charities. It is people like yourself who show that, for every hardship there has been a hero - or, of course, a heroine…
"So, in great admiration of your incredible efforts, my wife and I send you our warmest congratulations on your splendid achievement!"
Suilven, in the west of Sutherland in the Highlands, has an elevation of 731 metres.
Mrs Payne told the PA news agency: "I was so surprised and absolutely delighted to receive Prince Charles and the Duchess of Cornwall's handwritten letter today.
"I feel so humbled by their kind words, and everyone's generosity and ongoing support throughout my marathon challenge.
"It has given me the enthusiasm to keep going over the past 10 weeks, and will spur me on to reach the summit."
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